Question

If the S.D. of the data 1, 2, 4, 5, 6, 7, 9 is 2.59, then the S.D. of 3, 6, 12, 15, 18, 21, 27 is ______.

विकल्प

• 2.59

• 23.31

• 4.59

• 7.77

Answer 1

If the S.D. of the data 1, 2, 4, 5, 6, 7, 9 is 2.59, then the S.D. of 3, 6, 12, 15, 18, 21, 27 is 7.77.

Explanation:

`sigma ("aX") = "a" sigma ("X")`

∴ Required S.D. = 3 x 2.59 = 7.77