Two mark example problems I — task. Mathematics State Board, Class 9.

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1. Find the sum of the deviations from the arithmetic mean for the following observations:

$21$ ,

$30$ ,

$22$ ,

$16$ ,

$24$ ,

$28$ ,

$18$ ,

$17$

Answer:

The sum of deviations

$=$

2. The arithmetic mean of

$6$ values is

$45$ and if each value is increased by

$4$ , then find the arithmetic mean of new set of values.

Answer:

The arithmetic mean

$=$

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