Question

Marks obtained by students of a school in Economics subject follows normal distribution with mean µ and standard deviation σ. The value of standard score that a randomly selected student obtained 60 marks is 1. If the variance of variable is 100 (marks)², then find average marks.

Answer 1

Here, x = 60; Z = 1; σ² = 100 ∴ σ = 10

Hence, the average marks obtained is 50.