Calculating the Average Growth of a Child

Problem:

A child’s height has been measured once a year.
Columns A & B show the results of these measurements for a period of six years.
We want to use these figures to calculate the average number of centimeters the child grew each year.

Solution:

Use the AVERAGE function in the following Array formula:
{=AVERAGE(B3:B7-B2:B6)}

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