Question

Normally distributed population of test scores as a mean of 80 and a standard deviation of 5.2 what is the Z score if a student scores 73

Answer 1

`z=-1.35`

Explanation:

The formula to calculate the value of z is as follows

`\begin{gathered} z=(x-\mu)/(\sigma) \\ x=\text{ score} \\ \mu\text{ = mean} \\ \sigma=\text{ standard deviation} \end{gathered}`

we replace the values and we are left

`z=(73-80)/(5.2)=-1.35`