Question

The mean marks of 20 students is 62. It was later discovered that one of the
student marks was written wrongly as 86 instead of 68.Find the correct mean.

Answer 1

Step-by-step explanation:

Given mean=

$\frac{x + 68 - 86}{20} = 62 \\ x - 18 = 1240 \\ x = 1258$

Correct mean=

$\frac{1258}{20} \\ = 62.9$

MARK MY ANSWER BRAINLY IF IT'S HELPFUL.