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Algebraic sum of deviations of a list from its mean

The same question, asked 2 times: CDS 2 2020*, CDS 2 2026. Every wording below, oldest first.

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  1. Question 1

    CDS 2 2020

    97
    What is the algebraic sum of the deviations from the mean of a set of values 25, 65, 73, 75, 83, 76, 17, 15, 7, 14 ?

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  2. Question 2

    CDS 2 2026

    95
    If the heights (in cm) of 9 students of a class are 150, 165, 145, 149, 150, 147, 152, 144 and 148, then what is the algebraic sum of the heights measured from their arithmetic mean ?

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