Question

What is the z-score of sample X, if `n = 225, mu= 90, St. Dev. =90, and E[X] =78`?

Answer 1

`1.5`

Explanation:

Z-Score

= `(n - μ)/σ`

= `(225 - 90)/90`

= `135/90`

= `1.5`

Plug into z-score formula. `n` is your variable, `μ` is the mean, and `σ` is the standard deviation.