IXL | Mean and median: find the missing number

Helen has the following data:

If the mean is 9, which number could q be?

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Mitchell has the following data:

If the mean is 5, which number could n be?

The mean is the average of the numbers. You find the mean by adding the numbers together and then dividing by the number of numbers in the group.

There are 5 numbers in the group.

Try n = 21.

Find the sum of the numbers.

21 + 4 + 7 + 6 + 2 = 40

Divide by 5.

40 ÷ 5 = 8

When n = 21, the mean is 8.

Try n = 6.

Find the sum of the numbers.

6 + 4 + 7 + 6 + 2 = 25

Divide by 5.

25 ÷ 5 = 5

When n = 6, the mean is 5.

The mean is 5, so n = 6.

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