Question

value of x.
2. If the mean of 25 observations is 27 and each observation is decreased
by 7, what will be the new mean?
[CBSE 2014]
11 nino data:​

Answer 1

Answer:

mean of 25 observations =27

sum of 25 observations =27×65=675

subtracted 7 from each =25×7=175

so,sum of 25 observations-175 =675-175

sum of 25 observations-175 =500

mean of 25 observations =500÷25=20

ANS :20