Asample data set has a mean of 122.3 and a standard deviation of 18.5. convert a score of 168.4 to a z score and determine if the score is “usual” or “unusual.”

and this Z-score is “unusual.”

Step-by-step explanation:

To calculate the Z score use the following formula

Where

μ is the average

is the standard deviation

x is the data to which we will calculate the z-score

In this case

So

A z-score is unusual if or

Finally

and this Z-score is “unusual.”

54

step-by-step explanation: