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Questions  >>  JEEMAIN and NEET  >>  Mathematics  >>  Class11  >>  Statistics
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Q)

The first of the two sample has 100 items with mean 15 and S.D= 3. If the whole group has 250 items with mean 15.6 and SD = $ \sqrt{13.44}$ the S.D of the second group is?

$\begin {array} {1 1} (A)\;5 & \quad (B)\;4 \\ (C)\;6 & \quad (D)\;3.52 \end {array}$

 

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