The mean of a normally distributed group of weekly incomes for a group of executives is $2,400 and the standard deviation is $600.What is the z-score for an income of $1,500/week?
A)-1.5
B)-1.0
C)2.5
D)1.9

Question

Quizplus · Accepted Answer

The z-score is calculated by subtracting the mean from the value in question and then dividing by the standard deviation. For an income of $1,500, the calculation is ($1,500 - $2,400) / $600 = -$900 / $600 = -1.5.

The Mean of a Normally Distributed Group of Weekly Incomes