Application of Number
Level 2
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Mean - Tutorial 1
We use the mean to work out the 'average' of a set of numbers.
To find the mean:
add up all of the numbers and then divide by the number of numbers |
E.g. 1
If we wanted to find the mean price of a CD across five shops.
The data:
| HMV | £13.99 |
| Our Price | £12.99 |
| Virgin | £12.49 |
| Asda | £10.99 |
| WHSmith | £14.99 |
1. First we add up the numbers.
13.99 + 12.99 + 12.49 + 10.99 + 14.99 = 65.45
2. Then we divide by the number of numbers, in this case there were 5 numbers.
65.45 ÷ 5 = 13.09
So the mean price for a CD across five shops was £13.09.
E.g. 2
If we wanted to find the mean exam score of students.
The data:
| John | 85 |
| Sarah | 91 |
| Tim | 75 |
| Hasim | 89 |
| Jody | 86 |
| Graham | 95 |
| Tara | 99 |
| Wesley | 87 |
1. First we add up the numbers.
85 + 91 + 75 + 89 + 86 + 95 + 99 + 87 = 707
2. Then we divide by the number of numbers, in this case 8 exam results.
707 + 8 = 88.375
This rounds to 88
| Summary |
To find the mean
1.
Add up the numbers |
To practise finding the mean try this assessment.
Then go on to the next tutorial.
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