Question

if the mean of 25 observations is 27 and each observation is decreased by 7, what will be the new mean
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Answer 1

Answer:

20

Step-by-step explanation:

Mean= Sum of observations/No. Of observations

27 = Sum '' " / 25

Sum of observations =27×25=675

Since 7 is subtracted from 25 observations, total no. subtracted =7×25=175

New sum= 675-175=500

New mean = 500/25= 20