Question

The mean of 20 observations was found to be 32. Later, it was discovered that one observation 25 was misread as 52. Find the correct mean?​

Answer 1

Step-by-step explanation:

mean = sum/ no. of values

sum= mean × no. of values

sum of 20 = 32×20= 640

sum contains 52 instead 25

so actual sum = 640 -52+25 =613

actual mean = sum/ no. of values

= 613/ 20 = 30.65