For a group containing 100 observations, the arithmetic mean and standard deviation are 8 an
Channel: Doubtnut
Date: 2020-03-29

For a group containing 100 observations, the arithmetic mean and standard deviation are 8 and `sqrt(10.5)`. For 50 observations selected from the 100 observations, the arithmetic mean and standard deviations are 10 and 2 respectively. Find the arithmetic mean and the standard deviation of the other half.