Suppose that the ages of cars driven by employees at a company are normally distributed with a mean of 8 years and a standard de
viation of 3.2 years.
What is the z-score of a car that is 9.1 years old?
2 answers:
There follows the formula for "z-score:"
raw score - mean
z = ------------------------------
standard dev
9.1 - 8
Here, the z-score is z = ------------- = 0.344
3.2
Answer: The z-score of a car is 0.34375.
Step-by-step explanation:
Since we have given that
The ages of cars driven by employees at a company are normally distributed.
Mean =
= 8 years
Standard deviation =
= 3.2 years
Age of car = X = 9.1 years old.
We need to find the z-score of a car which is given by

Hence, the z-score of a car is 0.34375.
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