A Radio Station Claims That the Amount of Advertising Each

Multiple Choice

A radio station claims that the amount of advertising each hour has a mean of 13 minutes and a standard deviation of 1.8 minutes. You listen to the radio station for 1 hour and observe that the
Amount of advertising time is 8 minutes. Calculate the z-score for this amount of advertising time.

A) z = -9
B) z = 0.48
C) z = -2.78
D) z = 2.78