Question

The average cost per slice of pizza is $.88 with a standard deviation of five cents. What is the Z score of a slice of pizza with a cost of $.99

Answer 1

The z-score of the certain data point is calculated through the equation,

z-score = (x - m)/s

where x is the given data point, m is the mean, and s is the standard deviation.
Substituting the known values from the given,

z-score = ($0.99 - $0.88) / $0.05

z-score = 2.2

The answer to this item is 2.2.