# If SD of 15 items is 6 and each item is decreased by 1, find the SD of the new set.

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

## 1 Answer

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

1 answer

1 answer

1 answer

1 answer

1 answer

1 answer

1 answer