IXL | Mean: find the missing number

Patty has the following data:

If the mean is 8, which number could c be?

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Joe has the following data:

If the mean is 8, which number could t 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 t = 19.

Find the sum of the numbers.

6 + 8 + 19 + 6 + 11 = 50

Divide by 5.

50 ÷ 5 = 10

When t = 19, the mean is 10.

Try t = 9.

Find the sum of the numbers.

6 + 8 + 9 + 6 + 11 = 40

Divide by 5.

40 ÷ 5 = 8

When t = 9, the mean is 8.

The mean is 8, so t = 9.

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