Question

On a standard measure of hearing ability the mean is 300 and the standard deviation is 20. What is the z-score for a person who scores 260?

Answer 1

-2.

Explanation:

Using the formula `z=(x-barx)/s` where `x` is the data point you're evaluating, `barx` is the mean of the data set, and `s` is the sample standard deviation, we plug in the numbers were given to get:

`z=(260-300)/20=-2`

Hope this helps!