Determine and Interpret Z-Scores
-A Television Station Claims That the Amount

Multiple Choice

Determine and Interpret z-Scores
-A television station claims that the amount of advertising per hour of broadcast time has an average of 17 minutes and a standard deviation equal to 2.2 minutes. You watch the station for 1 hour, at a randomly selected time, and carefully observe that the amount of advertising time is equal to 7 minutes. Calculate the z-score for this amount of advertising time.

A) $z = - 4.55$
B) $z = 4.55$
C) $z = - 0.28$
D) $z = 0.28$