Statistics and Probability: JEE Main 2021 Mathematics question

JEE Main 2021 · 25 Jul, Evening shift · Q5466

JEE Main 202125 Jul, Evening shiftMathematicsMediumStatistics and Probability258× since 2002

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 :

Statistics and Probability: JEE Main 2021 Mathematics question

JEE Main 2021 · 25 Jul, Evening shift · Q5466

JEE Main 202125 Jul, Evening shiftMathematicsMediumStatistics and Probability258× since 2002

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 :

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