Question

Compute the z-score for X=26; where the mean = 20 and standard deviation = 3? a)6 b)3 c)9 d)2

Answer 1

`z=(x-mu)/(sigma)=(26-20)/3=2`

Explanation:

The z-score is a measure of how far from the mean, in terms of standard deviations, a score is.
In this case 26 is 6 units away from the mean, or two standard deviations.