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Q.

The S.D. of 15 items is 6 and if each item is decreased or increased by 1, then standard deviation will be:

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a

5

b

7

c

91/15

d

6

answer is D.

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Detailed Solution

If each item of a data is increased or decreased by the same constant, the standard deviation of the data remains unchanged.

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The S.D. of 15 items is 6 and if each item is decreased or increased by 1, then standard deviation will be: