Question

The mean and Standard Deviation for a group of observations are 65 and 7.03 respectively. If 60 of these observations have mean & SD as 70 and 3 respectively, what is the SD for the group comprising 40 observations ?

Answer 1

Answer:

We are given that Mean and S.D. for group of 100 observations are 65 and 7.03 respectively. Also, 60 of these observations have mean and S.D. as 70 and 3 respectively. Therefore, Mean of remaining 40 observations, = = = 57.5 .

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