Question

The mean of 40 observations was 160 it was detacted on rechecking that the value of 165 was wrongly copied as 125 for complutation of mean find the correct mean.

Answer 1

Answer:

161

Step-by-step explanation:

Incorrect Mean = 160 right?

To find the correct mean first we need find sum of all observations

Incorrect sum of all obs.= 160 × 40 = 6400

Correct  sum of alll obs.= 6400-125+165= 6440

Correct mean = 6440/40

 

U will get the answer 161.