on a standardized exam, the scores are normally distributed with a mean of 80 and a standard deviation of…
on a standardized exam, the scores are normally distributed with a mean of 80 and a standard deviation of 20. find the z - score of a person who scored 90 on the exam.
Answer
Answer:
$0.5$
Explanation:
Step1: Recall z - score formula
$z=\frac{x-\mu}{\sigma}$
Step2: Identify values
$x = 90$, $\mu=80$, $\sigma = 20$
Step3: Substitute values into formula
$z=\frac{90 - 80}{20}=\frac{10}{20}=0.5$