Provide an appropriate response.
-A radio station claims that the amount of advertising per hour of broadcast time has an average of 17 minutes and a standard deviation equal to 2.7 minutes. You listen to the radio station for 1 hour, at a randomly selected
Time, and carefully observe that the amount of advertising time is equal to 11 minutes. Calculate the z-score for
This amount of advertising time.
A)z = -2.22
B)z = 2.22
C)z = -0.49
D)z = 0.49

Question

Quizplus · Accepted Answer

The z-score is calculated using the formula $z = \frac{(X - \mu)}{\sigma}$, where $X$ is the observed value, $\mu$ is the mean, and $\sigma$ is the standard deviation. Substituting the given values, $z = \frac{(11 - 17)}{2.7} = -2.22$.

Provide an Appropriate Response