Statistic

Mean with Value Missing (Level 5)

This math topic focuses on advanced problems related to calculating the mean of a set when a value is missing. Practicing skills include determining what number should replace the missing value (denoted as '?') in a series to achieve the specified average. Each problem provides a series of numbers with one value missing and a stated mean. Students must use their understanding of mean calculation to find the correct missing number from multiple choices provided. This involves multiplying, adding, and reasoning to back-calculate the missing value that results in the given mean.

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Mean with Value Missing

Complete these online problems with 80% or 4 correct answers in a row. Results are immediate.


What is the missing number that results in these numbers having the given mean

13, 17, ?, 9, 7

mean = 11

?