Math, asked by KIRTIPAL74851, 4 months ago

The mean and variance calculated from a group of 80 observations 63.2 and 25.98 respectively if 60 of these observations have mean 64.8 and standard deviation .. find the mean and standard deviation 20 observations

Answers

Answered by mabhigya

3

Step-by-step explanation:

For mean

Total = 80 * 63.2 = 5056

Sum of 60 = 60* 64.8 = 3888

Sum of remaining 20 = 5056-3888 = 1168

Hence

Mean of remaining 20 = 1168/20 = 58.4

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