Someone's z-score on a test can only be known if we know both the population mean of the test and the standard deviation.

Question

Quizplus · Accepted Answer

A z-score is calculated using the formula $z = \frac{(X - \mu)}{\sigma}$, where $X$ is the individual score, $\mu$ is the population mean, and $\sigma$ is the population standard deviation. Without knowing both the population mean and the standard deviation, the z-score cannot be accurately calculated.

Someone's Z-Score on a Test Can Only Be Known If