Twenty students were randomly selected from a business statistics course and were asked to report the number of times that they had eaten a meal at the university's cafeteria within the past month. Below are the values reported:
7, 8, 10, 11, 8, 6, 10, 9, 9, 8, 13, 12, 8, 11, 11, 14, 8, 7, 10, 12

-Find the z-score for an IQ test score of 92.2 when the mean is 100 and the standard deviation is 15.
A)0.53
B)0.77
C)-0.77
D)-0.52
E)-8.00

Question

Twenty students were randomly selected from a business statistics course and were asked to report the number of times that they had eaten a meal at the university's cafeteria within the past month. Below are the values reported:
7, 8, 10, 11, 8, 6, 10, 9, 9, 8, 13, 12, 8, 11, 11, 14, 8, 7, 10, 12

-Find the z-score for an IQ test score of 92.2 when the mean is 100 and the standard deviation is 15.
A)0.53
B)0.77
C)-0.77
D)-0.52
E)-8.00

Quizplus · Accepted Answer

The z-score is calculated using the formula $z = \frac{(X - \mu)}{\sigma}$, where $X$ is the value in question, $\mu$ is the mean, and $\sigma$ is the standard deviation. Substituting the given values: $z = \frac{(92.2 - 100)}{15} = -0.52$.

Twenty Students Were Randomly Selected from a Business Statistics Course