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Missing value that gives a certain mean

Find the missing value that gives a certain mean

This math skill teaches how to find a missing number in a set so that the set has a specific mean by using the formula for mean (total sum of values divided by number of values).

Learn missing value that gives a certain mean

Teaching Transcript

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Ten, something, and 7 have a mean of 7. What number is missing?

Mean is the sum divided by the count

So, the sum of the 3 numbers must be 21 if the mean is 7

So 10 plus 7, plus the mystery number equals 21. So our mystery number must be 4

Skill Practice

Find the missing value that gives a certain mean

Test your understanding of missing value that gives a certain mean by practicing it! Work through the below exercises to use it in practice.