The average attendance for your local hockey team is 450,000 per game.The attendance during the last game was only 320,000 which corresponded to a z-score of -16.25.Find the standard deviation.
A)1000 people
B)17,000 people
C)3000 people
D)20,000 people
E)8000 people

Question

Quizplus · Accepted Answer

The z-score formula is $z = \frac{(X - \mu)}{\sigma}$, where $X$ is the value from the dataset, $\mu$ is the mean, and $\sigma$ is the standard deviation. Plugging in the given values: $-16.25 = \frac{(320,000 - 450,000)}{\sigma}$. Solving for $\sigma$ gives $\sigma = 8,000$ people.

The Average Attendance for Your Local Hockey Team Is 450,000