jee-main 2021 Q71

jee-main · India · session3_25jul_shift2 Measures of Location and Spread
The first of the two samples in a group has 100 items with mean 15 and standard deviation 3. If the whole group has 250 items with mean 15.6 and standard deviation $\sqrt { 13.44 }$, then the standard deviation of the second sample is:
(1) 8
(2) 6
(3) 4
(4) 5 
The first of the two samples in a group has 100 items with mean 15 and standard deviation 3. If the whole group has 250 items with mean 15.6 and standard deviation $\sqrt { 13.44 }$, then the standard deviation of the second sample is:\\
(1) 8\\
(2) 6\\
(3) 4\\
(4) 5
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