Question

mean of 40 numbers is 37.5.if one of these numbers is taken as 53 instead of 35 find the correct mean​

Answer 1

Ans- 37.05

40z = 37.5

z= 1500

for 39z

39z= 1500-53 =1447

calculate using 35 for new sum

1447+35 = 1482

Avg : 1482/40 = 37.05