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Ten, something, and 7 have a mean of 7. What number is missing?
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Mean is the sum divided by the count
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So, the sum of the 3 numbers must be 21 if the mean is 7
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So 10 plus 7, plus the mystery number equals 21. So our mystery number must be 4
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).
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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.