Question

What is the z-score of sample X, if `n = 121, mu= 33, St. Dev. =110, and E[X] =46`?

Answer 1

The z-score is `=1.3`

Explanation:

The z-score for a sample mean is `=(barx-mu)/(sigma/sqrtn)`

Therefore, the z-score is `(46-33)/(110/sqrt121)=13/(110/11)=13/10=1.3`