The mean and sd deviation for a group of 100 observations are 65 and 7.03 respectively.if 60 if these observations have mean and sd as70and 3respectively, what is the sd for the group comprising 40observations?
Question
The mean and sd deviation for a group of 100 observations are 65 and 7.03 respectively.if 60 if these observations have mean and sd as70and 3respectively, what is the sd for the group comprising 40observations?
Maths
Feb. 26, 2019, 5:58 p.m.
Answer
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