# Statistics - Mean

**Question 1**

To calculate the mean, add up all the numbers, and divide by how many there are.

Find the mean of the following (non calculator):

a) $2,3,7$

a
$4$

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The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=2+3+7=12$

There are $3$ numbers.

So the mean $={12}\div{3}=4$

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b) $1,4,7,8$

a
$5$

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The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=1+4+7+8=20$

There are $4$ numbers.

So the mean $={20}\div{4}=5$

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c) $4,8,11,12,15$

a
$10$

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The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=4+8+11+12+15=50$

There are $5$ numbers.

So the mean $={50}\div{5}=10$

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d) $8,2,6,8$

a
$6$

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The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=8+2+6+8=24$

Order does not matter.

There are $4$ numbers.

So the mean $={24}\div{4}=6$

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e) $11,2,14,5$

a
$8$

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The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=11+2+14+5=32$

Order does not matter.

There are $4$ numbers.

So the mean $={32}\div{4}=8$

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f) $2,3,4,5,6$

a
$4$

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The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=2+3+4+5+6=20$

There are $5$ numbers.

So the mean $={20}\div{5}=4$

You may also see that either side of $4$, $2$ and $6$ are equally far away and $3$ and $5$ are equally far away so they cancel out to make $4$ the mean.

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g) $9,5,7,3,6,8,4$

a
$6$

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The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=9+5+7+3+6+8+4=42$

Order does not matter.

There are $7$ numbers.

So the mean $={42}\div{7}=6$

You may also want to put the numbers in order.

$3,4,5,6,7,8,9$

You may see that either side of $6$, $5$ and $7$ are equally far away, likewise for the others, so they cancel out to make $6$ the mean without further calculation needed.

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h) $8,12,4,17,4$

a
$9$

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The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=8+12+4+17+4=45$

Order does not matter.

There are $5$ numbers.

So the mean $={45}\div{5}=9$

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i) $18,1,17,14,6,2$

a
$13$

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The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $18+1+17+14+6+2=78$,

Order does not matter.

There are $6$ numbers.

So the mean $={78}\div{6}=13$

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j) $101,102,105,108$

a
$104$

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The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=101+102+105+108=416$,

There are $4$ numbers.

So the mean $={416}\div{4}=104$

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k) $5,6$

a
$5.5$

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The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=5+6=11$,

There are $2$ numbers.

So the mean $={11}\div{2}=5.5$

The mean can be any number, including a decimal.

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l) $7,9,9,4$

a
$7.25$ or $7\frac14$

Question ID: 70020010120

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The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=7+9+9+4=29$,

Order does not matter.

There are $4$ numbers.

So the mean $={29}\div{4}=7r1=7.25$ or $7\frac14$

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m) $13,2,7,18,3$

a
$8.6$

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The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $13+2+7+18+3=43$

Order does not matter.

There are $5$ numbers.

So the mean $=\frac{43}{5}=8\frac35$ or $8.6$

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n) $18,97,14,11$

a
$35$

Question ID: 70020010140

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The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=18+97+14+11=140$

Order does not matter.

There are $4$ numbers.

So the mean $=\frac{140}{4}=\frac{70}{2}=35$

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o) $64,14,43,11,72$

a
$40\frac{4}{5}$ or $40.8$

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The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=64+14+43+11+72=204$

Order does not matter.

There are $5$ numbers.

So the mean $=\frac{204}{5}=40\frac{4}{5}$ or $40.8$

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**Question 2**

Find the mean of the following (calculator):

a) $14,17,22,44$

a
$24.25$

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b) $35,5,36,22,15$

a
$22.6$

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c) $47,12,94,24,1,56$

a
$39$

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d) $3,3,3,3,3,5,5,5,5,5$

a
$4$

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e) $131,166,131,155,201,59$

a
$140.5$

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f) $22.4,55.9,18.5,24.3$

a
$30.275$

Question ID: 70020020060

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g) $101.4,55.8,23.7,187.3,11.2,400$

a
$129.9$

Question ID: 70020020070

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h) $323.9,523.11,53.4,911.54,75.5,322.74,632.55,233.76$

a
$384.5625$

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i) $3146,414,5317,1432,8794,1342,5237,2381,1235,548,587,4892$

a
$2943.75$

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**Question 3**

Answer the following worded questions:

a) I ate the following servings of fruit in a week:

$3,4,3,5,2,0,4$

What was the mean amount of fruit I ate each day?

a
Each day I ate a mean of $3$ pieces of fruit. That's not enough!

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b) Over a season I scored the following in matches:

$4,7,2,4,6,2,5,2$

What is my mean score?

a
My mean score is $4$

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c) What is the mean of the following prices?

$\$2.50,\$4.25,\$3.75,\$8,\$1.50$

a
The mean price is $\$4$

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d) Sam has $10$ friends at his birthday. Their ages are:

$12,12,13,12,13,12,10,13,12,11$

What is their mean age?

a
Their mean age is $12$

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e) The hourly wage of $5$ workers at Arms Factory are:

£$8,$£$10,$£$14,$£$11,$£$13$

The hourly wage of $6$ workers at Bran Factory are:

£$7,$£$13,$£$14,$£$10,$£$9,$£$10$

Which factory has a higher mean wage and by how much?

a
Factorys Arms has a higher mean wage by $70$ pence or £$0.70$

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**Question 4**

Find the missing piece of data in each of the following if their mean is $10$.

a) $9,\square,11$

a
$10$

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b) $6,\square$

a
$14$

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c) $\square,16,2$

a
$12$

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d) $25,\square,3,8,20,1$

a
$3$

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e) $4,5,6,7,8,9,\square,$

a
$21$

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**Question 5**

Find the missing piece of data in each of the following if their mean is $12$.

a) $12,\square,13$

a
$11$

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b) $0,\square$

a
$24$

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c) $15,16,13,\square,15$

a
$1$

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d) $13.5,\square,12.5,18.5,5.5,7.5$

a
$14.5$

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**Question 6**

Find the missing piece of data in each of the following if their mean is $6.6$.

a) $\square,6.6$

a
$6.6$

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b) $\square,10,3$

a
$6.8$

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c) $0,8.4,\square,4.2,10$

a
$10.4$

Question ID: 70020060030

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d) $6.75,\square,2.2,8.25,9.8,16,0.5$

a
$2.7$

Question ID: 70020060040

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**Question 7**

Find the mean of the following data set:

a)

Result |
Frequency |

9 |
1 |

10 |
3 |

11 |
1 |

12 |
5 |

a
$11$

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b)

Result |
Frequency |

25 |
3 |

26 |
4 |

27 |
2 |

28 |
1 |

a
$26.1$

Question ID: 70020070020

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c)

Result |
Frequency |

4 |
8 |

5 |
4 |

6 |
10 |

7 |
1 |

8 |
2 |

a
$5.4$

Question ID: 70020070030

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**Question 8**

Find the mean of the following (involves negative numbers):

a) $-4,-5,-9$

a
$-6$

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b) $-16,-5,-20,-11$

a
$-13$

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c) $-2,2$

a
$0$

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d) $-4,-2,3,11$

a
$2$

Question ID: 70020080040

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e) $-10,0,15,-4,-6$

a
$-1$

Question ID: 70020080050

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f) $7,-7,8,-8,9,-9$

a
$0$

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g) $44,-6,8,-20,15,-35$

a
$1$

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h) $-72,84,22,-16,0,44,50,-204$

a
$-11.5$

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i) $-125,215,-12,61,77,-821,521,22,124,-5,-124,13$

a
$-4.5$

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j) $-5.2,7.3,-33,-3.6,-66,-12.7,22,5.94$

a
$-10.6625$

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**Question 9**

Find the missing piece of data in each of the following if their mean is $0$.

a) $\square,6$

a
$-6$

Question ID: 70020090010

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b) $12,\square,-1$

a
$-11$

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c) $\square,32,-16,8,-4.4$

a
$-19.6$

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d) $-6,20,\square,44,-18,-9,0$

a
$-31$

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**Question 10**

Find the missing piece of data in each of the following if their mean is $-5$.

a) $\square,-2$

a
$-8$

Question ID: 70020100010

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b) $0,\square$

a
$-10$

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c) $\square,4,8$

a
$-27$

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d) $2,-5,\square,8,-10$

a
$-5$

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e) $0.4,-4.3,\square,-4.5,-6.2,-9$

a
$-6.4$

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**Question 11**

Answer the following worded questions:

a) Trule Inc. records how its profit over $5$ years:

$\$44,000\quad\$50,000\quad\$12,000\quad\$60,000\quad\$15,000$

What was it's mean annual profit?

a
$\$36,200$

Question ID: 70020110010

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b) Iota Inc. records how its profits/loss over $4$ years:

$\$10,000\quad-\$16,000\quad\$34,000\quad-\$4,000$

Calculate the mean profit/loss over the $4$ years.

a
$\$6,000$ profit

Question ID: 70020110020

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**Question 1**

To calculate the mean, add up all the numbers, and divide by how many there are.

Find the mean of the following (non calculator):

a) $2,3,7$

b) $1,4,7,8$

c) $4,8,11,12,15$

d) $8,2,6,8$

e) $11,2,14,5$

f) $2,3,4,5,6$

g) $9,5,7,3,6,8,4$

h) $8,12,4,17,4$

i) $18,1,17,14,6,2$

j) $101,102,105,108$

k) $5,6$

l) $7,9,9,4$

m) $13,2,7,18,3$

n) $18,97,14,11$

o) $64,14,43,11,72$

**Question 2**

Find the mean of the following (calculator):

a) $14,17,22,44$

b) $35,5,36,22,15$

c) $47,12,94,24,1,56$

d) $3,3,3,3,3,5,5,5,5,5$

e) $131,166,131,155,201,59$

f) $22.4,55.9,18.5,24.3$

g) $101.4,55.8,23.7,187.3,11.2,400$

h) $323.9,523.11,53.4,911.54,75.5,322.74,632.55,233.76$

i) $3146,414,5317,1432,8794,1342,5237,2381,1235,548,587,4892$

**Question 3**

Answer the following worded questions:

a) I ate the following servings of fruit in a week:

$3,4,3,5,2,0,4$

What was the mean amount of fruit I ate each day?

b) Over a season I scored the following in matches:

$4,7,2,4,6,2,5,2$

What is my mean score?

c) What is the mean of the following prices?

$\$2.50,\$4.25,\$3.75,\$8,\$1.50$

d) Sam has $10$ friends at his birthday. Their ages are:

$12,12,13,12,13,12,10,13,12,11$

What is their mean age?

e) The hourly wage of $5$ workers at Arms Factory are:

£$8,$£$10,$£$14,$£$11,$£$13$

The hourly wage of $6$ workers at Bran Factory are:

£$7,$£$13,$£$14,$£$10,$£$9,$£$10$

Which factory has a higher mean wage and by how much?

**Question 4**

Find the missing piece of data in each of the following if their mean is $10$.

a) $9,\square,11$

b) $6,\square$

c) $\square,16,2$

d) $25,\square,3,8,20,1$

e) $4,5,6,7,8,9,\square,$

**Question 5**

Find the missing piece of data in each of the following if their mean is $12$.

a) $12,\square,13$

b) $0,\square$

c) $15,16,13,\square,15$

d) $13.5,\square,12.5,18.5,5.5,7.5$

**Question 6**

Find the missing piece of data in each of the following if their mean is $6.6$.

a) $\square,6.6$

b) $\square,10,3$

c) $0,8.4,\square,4.2,10$

d) $6.75,\square,2.2,8.25,9.8,16,0.5$

**Question 7**

Find the mean of the following data set:

a)

Result |
Frequency |

9 |
1 |

10 |
3 |

11 |
1 |

12 |
5 |

b)

Result |
Frequency |

25 |
3 |

26 |
4 |

27 |
2 |

28 |
1 |

c)

Result |
Frequency |

4 |
8 |

5 |
4 |

6 |
10 |

7 |
1 |

8 |
2 |

**Question 8**

Find the mean of the following (involves negative numbers):

a) $-4,-5,-9$

b) $-16,-5,-20,-11$

c) $-2,2$

d) $-4,-2,3,11$

e) $-10,0,15,-4,-6$

f) $7,-7,8,-8,9,-9$

g) $44,-6,8,-20,15,-35$

h) $-72,84,22,-16,0,44,50,-204$

i) $-125,215,-12,61,77,-821,521,22,124,-5,-124,13$

j) $-5.2,7.3,-33,-3.6,-66,-12.7,22,5.94$

**Question 9**

Find the missing piece of data in each of the following if their mean is $0$.

a) $\square,6$

b) $12,\square,-1$

c) $\square,32,-16,8,-4.4$

d) $-6,20,\square,44,-18,-9,0$

**Question 10**

Find the missing piece of data in each of the following if their mean is $-5$.

a) $\square,-2$

b) $0,\square$

c) $\square,4,8$

d) $2,-5,\square,8,-10$

e) $0.4,-4.3,\square,-4.5,-6.2,-9$

**Question 11**

Answer the following worded questions:

a) Trule Inc. records how its profit over $5$ years:

$\$44,000\quad\$50,000\quad\$12,000\quad\$60,000\quad\$15,000$

What was it's mean annual profit?

b) Iota Inc. records how its profits/loss over $4$ years:

$\$10,000\quad-\$16,000\quad\$34,000\quad-\$4,000$

Calculate the mean profit/loss over the $4$ years.

__Answers__

**Question 1**

a) $4$

b) $5$

c) $10$

d) $6$

e) $8$

f) $4$

g) $6$

h) $9$

i) $13$

j) $104$

k) $5.5$

l) $7.25$ or $7\frac14$

m) $8.6$

n) $35$

o) $40\frac{4}{5}$ or $40.8$

**Question 2**

a) $24.25$

b) $22.6$

c) $39$

d) $4$

e) $140.5$

f) $30.275$

g) $129.9$

h) $384.5625$

i) $2943.75$

**Question 3**

a) Each day I ate a mean of $3$ pieces of fruit. That's not enough!

b) My mean score is $4$

c) The mean price is $\$4$

d) Their mean age is $12$

e) Factorys Arms has a higher mean wage by $70$ pence or £$0.70$

**Question 4**

a) $10$

b) $14$

c) $12$

d) $3$

e) $21$

**Question 5**

a) $11$

b) $24$

c) $1$

d) $14.5$

**Question 6**

a) $6.6$

b) $6.8$

c) $10.4$

d) $2.7$

**Question 7**

a) $11$

b) $26.1$

c) $5.4$

**Question 8**

a) $-6$

b) $-13$

c) $0$

d) $2$

e) $-1$

f) $0$

g) $1$

h) $-11.5$

i) $-4.5$

j) $-10.6625$

**Question 9**

a) $-6$

b) $-11$

c) $-19.6$

d) $-31$

**Question 10**

a) $-8$

b) $-10$

c) $-27$

d) $-5$

e) $-6.4$

**Question 11**

a) $\$36,200$

b) $\$6,000$ profit

**Question 1**

To calculate the mean, add up all the numbers, and divide by how many there are.

Find the mean of the following (non calculator):

a) $2,3,7$

b) $1,4,7,8$

c) $4,8,11,12,15$

d) $8,2,6,8$

e) $11,2,14,5$

f) $2,3,4,5,6$

g) $9,5,7,3,6,8,4$

h) $8,12,4,17,4$

i) $18,1,17,14,6,2$

j) $101,102,105,108$

k) $5,6$

l) $7,9,9,4$

m) $13,2,7,18,3$

n) $18,97,14,11$

o) $64,14,43,11,72$

**Question 2**

Find the mean of the following (calculator):

a) $14,17,22,44$

b) $35,5,36,22,15$

c) $47,12,94,24,1,56$

d) $3,3,3,3,3,5,5,5,5,5$

e) $131,166,131,155,201,59$

f) $22.4,55.9,18.5,24.3$

g) $101.4,55.8,23.7,187.3,11.2,400$

h) $323.9,523.11,53.4,911.54,75.5,322.74,632.55,233.76$

i) $3146,414,5317,1432,8794,1342,5237,2381,1235,548,587,4892$

**Question 3**

Answer the following worded questions:

a) I ate the following servings of fruit in a week:

$3,4,3,5,2,0,4$

What was the mean amount of fruit I ate each day?

b) Over a season I scored the following in matches:

$4,7,2,4,6,2,5,2$

What is my mean score?

c) What is the mean of the following prices?

$\$2.50,\$4.25,\$3.75,\$8,\$1.50$

d) Sam has $10$ friends at his birthday. Their ages are:

$12,12,13,12,13,12,10,13,12,11$

What is their mean age?

e) The hourly wage of $5$ workers at Arms Factory are:

£$8,$£$10,$£$14,$£$11,$£$13$

The hourly wage of $6$ workers at Bran Factory are:

£$7,$£$13,$£$14,$£$10,$£$9,$£$10$

Which factory has a higher mean wage and by how much?

**Question 4**

Find the missing piece of data in each of the following if their mean is $10$.

a) $9,\square,11$

b) $6,\square$

c) $\square,16,2$

d) $25,\square,3,8,20,1$

e) $4,5,6,7,8,9,\square,$

**Question 5**

Find the missing piece of data in each of the following if their mean is $12$.

a) $12,\square,13$

b) $0,\square$

c) $15,16,13,\square,15$

d) $13.5,\square,12.5,18.5,5.5,7.5$

**Question 6**

Find the missing piece of data in each of the following if their mean is $6.6$.

a) $\square,6.6$

b) $\square,10,3$

c) $0,8.4,\square,4.2,10$

d) $6.75,\square,2.2,8.25,9.8,16,0.5$

**Question 7**

Find the mean of the following data set:

a)

Result |
Frequency |

9 |
1 |

10 |
3 |

11 |
1 |

12 |
5 |

b)

Result |
Frequency |

25 |
3 |

26 |
4 |

27 |
2 |

28 |
1 |

c)

Result |
Frequency |

4 |
8 |

5 |
4 |

6 |
10 |

7 |
1 |

8 |
2 |

**Question 8**

Find the mean of the following (involves negative numbers):

a) $-4,-5,-9$

b) $-16,-5,-20,-11$

c) $-2,2$

d) $-4,-2,3,11$

e) $-10,0,15,-4,-6$

f) $7,-7,8,-8,9,-9$

g) $44,-6,8,-20,15,-35$

h) $-72,84,22,-16,0,44,50,-204$

i) $-125,215,-12,61,77,-821,521,22,124,-5,-124,13$

j) $-5.2,7.3,-33,-3.6,-66,-12.7,22,5.94$

**Question 9**

Find the missing piece of data in each of the following if their mean is $0$.

a) $\square,6$

b) $12,\square,-1$

c) $\square,32,-16,8,-4.4$

d) $-6,20,\square,44,-18,-9,0$

**Question 10**

Find the missing piece of data in each of the following if their mean is $-5$.

a) $\square,-2$

b) $0,\square$

c) $\square,4,8$

d) $2,-5,\square,8,-10$

e) $0.4,-4.3,\square,-4.5,-6.2,-9$

**Question 11**

Answer the following worded questions:

a) Trule Inc. records how its profit over $5$ years:

$\$44,000\quad\$50,000\quad\$12,000\quad\$60,000\quad\$15,000$

What was it's mean annual profit?

b) Iota Inc. records how its profits/loss over $4$ years:

$\$10,000\quad-\$16,000\quad\$34,000\quad-\$4,000$

Calculate the mean profit/loss over the $4$ years.

__Answers__

**Question 1**

a) $4$

b) $5$

c) $10$

d) $6$

e) $8$

f) $4$

g) $6$

h) $9$

i) $13$

j) $104$

k) $5.5$

l) $7.25$ or $7\frac14$

m) $8.6$

n) $35$

o) $40\frac{4}{5}$ or $40.8$

**Question 2**

a) $24.25$

b) $22.6$

c) $39$

d) $4$

e) $140.5$

f) $30.275$

g) $129.9$

h) $384.5625$

i) $2943.75$

**Question 3**

a) Each day I ate a mean of $3$ pieces of fruit. That's not enough!

b) My mean score is $4$

c) The mean price is $\$4$

d) Their mean age is $12$

e) Factorys Arms has a higher mean wage by $70$ pence or £$0.70$

**Question 4**

a) $10$

b) $14$

c) $12$

d) $3$

e) $21$

**Question 5**

a) $11$

b) $24$

c) $1$

d) $14.5$

**Question 6**

a) $6.6$

b) $6.8$

c) $10.4$

d) $2.7$

**Question 7**

a) $11$

b) $26.1$

c) $5.4$

**Question 8**

a) $-6$

b) $-13$

c) $0$

d) $2$

e) $-1$

f) $0$

g) $1$

h) $-11.5$

i) $-4.5$

j) $-10.6625$

**Question 9**

a) $-6$

b) $-11$

c) $-19.6$

d) $-31$

**Question 10**

a) $-8$

b) $-10$

c) $-27$

d) $-5$

e) $-6.4$

**Question 11**

a) $\$36,200$

b) $\$6,000$ profit

__Solutions__

**Question 1**

a) The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=2+3+7=12$

There are $3$ numbers.

So the mean $={12}\div{3}=4$

b) The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=1+4+7+8=20$

There are $4$ numbers.

So the mean $={20}\div{4}=5$

c) The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=4+8+11+12+15=50$

There are $5$ numbers.

So the mean $={50}\div{5}=10$

d) The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=8+2+6+8=24$

Order does not matter.

There are $4$ numbers.

So the mean $={24}\div{4}=6$

e) The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=11+2+14+5=32$

Order does not matter.

There are $4$ numbers.

So the mean $={32}\div{4}=8$

f) The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=2+3+4+5+6=20$

There are $5$ numbers.

So the mean $={20}\div{5}=4$

You may also see that either side of $4$, $2$ and $6$ are equally far away and $3$ and $5$ are equally far away so they cancel out to make $4$ the mean.

g) The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=9+5+7+3+6+8+4=42$

Order does not matter.

There are $7$ numbers.

So the mean $={42}\div{7}=6$

You may also want to put the numbers in order.

$3,4,5,6,7,8,9$

You may see that either side of $6$, $5$ and $7$ are equally far away, likewise for the others, so they cancel out to make $6$ the mean without further calculation needed.

h) The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=8+12+4+17+4=45$

Order does not matter.

There are $5$ numbers.

So the mean $={45}\div{5}=9$

i) The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $18+1+17+14+6+2=78$,

Order does not matter.

There are $6$ numbers.

So the mean $={78}\div{6}=13$

j) The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=101+102+105+108=416$,

There are $4$ numbers.

So the mean $={416}\div{4}=104$

k) The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=5+6=11$,

There are $2$ numbers.

So the mean $={11}\div{2}=5.5$

The mean can be any number, including a decimal.

l) The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=7+9+9+4=29$,

Order does not matter.

There are $4$ numbers.

So the mean $={29}\div{4}=7r1=7.25$ or $7\frac14$

m) The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $13+2+7+18+3=43$

Order does not matter.

There are $5$ numbers.

So the mean $=\frac{43}{5}=8\frac35$ or $8.6$

n) The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=18+97+14+11=140$

Order does not matter.

There are $4$ numbers.

So the mean $=\frac{140}{4}=\frac{70}{2}=35$

o) The mean is the sum off all the numbers, divided by how many there are.

The sum of the numbers $=64+14+43+11+72=204$

Order does not matter.

There are $5$ numbers.

So the mean $=\frac{204}{5}=40\frac{4}{5}$ or $40.8$

**Question 2**

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