The median number of students in each music class is 19 people. 16,__,24,17,20,21 What should be the number in the blank?

1 answer:

3 0

20 is the lowest of the upper 3 numbers, so the missing number must be 19 when averaged with 20. That is, the missing number must be ...
2*19 -20 = 18

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for the amounts above, we get 2640 and 2100 respectively

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$\bf \begin{array}{ccllll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
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