Question

What is the z-score of X, if n = 25, `mu= 60`, SD = 12, and X =58?

Answer 1

Z-score is `-0.833`

Explanation:

z-score of variable `x` with mean `mu`, and standard deviation `sigma` is given by `(x-mu)/(sigma/sqrtn)`

As `mu=60`, `sigma=12`, `n=25` and `x=58`

z-score is `(58-60)/(12/sqrt25)=((-2)*5)/12=-0.833`