Question

mean of 10 observations was found to be 51. later on it was found that the observation 62 was misread as 73. find the correct answer

Answer 1

let sum of observation=X
X/10=51
X=510
so acc to que
X=510-73+62=499
NEW MEAN=499/10=49.9

Answer 2

mean if 10 observations=51
total sum=51×10= 510
observation 62 was misread as 73 so
73-62=11
correct sum= 510-11= 499
correct mean= 499/10 = 49.9.
I hope it is easy.