Q .     For two data sets, each of size `5`, the variances are given to be `4` and `5` and the corresponding means are given to be `2` and `4`, respectively. The variance of the combined data set is

JEE 2010
A

`11/2`

B

` 6`

C

`13/2`

D

`5/2`

HINT

From the definition of variance, we have: `:. sigma_x^2 = (Sigma x_i^2)/n - (bar x)^2`

Today's Score

0
Success Rate: NAN %

Practice & Test

Sr. No.SubjectTagCorrectRecorded Answer