Question

The scores on a psychology exam were normally distributed with a mean of 69 and a standard deviation of 4. What is the standard score for an exam score of 68​?

The standard score is ?

Answer 1

0.25

Explanation:

Given that :

Mean score, μ = 69

Standard deviation, σ = 4

Score, x = 64

The standardized score, Zscore can be obtained using the formular :

Zscore = (x - μ) / σ

Zscore = (69 - 68) / 4

Zscore = 1 / 4

Zscore = 0.25