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Home  >>  JEEMAIN and AIPMT  >>  Mathematics  >>  Class11  >>  Statistics
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If SD of 15 items is 6 and each item is decreased by 1, find the SD of the new set.

$\begin {array} {1 1} (A)\;10 & \quad (B)\;6 \\ (C)\;11 & \quad (D)\;15 \end {array}$

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If each item of a data is increased or decreased by the same amount.
The SD of the data remains unchanged.
$ \therefore $ SD of new set is 15
Ans : (D)
answered Jan 31, 2014 by thanvigandhi_1

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