Suppose the ages of cars driven by employees at a company are normally distributed with a mean of 8 years and a standard deviation of 3.2 years.
What is the z-score of a car that is 6 years old?
(Points : 1)
–0.625
–1.6
1.6
0.625

Question

Suppose the ages of cars driven by employees at a company are normally distributed with a mean of 8 years and a standard deviation of 3.2 years.
What is the z-score of a car that is 6 years old? 
(Points : 1)
       –0.625
       –1.6
       1.6
       0.625

imstuck · Answer

The normally distributed data looks like this on the curve:|dw:1409674808661:dw|

imstuck · Answer

The mean is 8 and the standard deviation is spread out in increments of the mean plus 3.2 to the right and the mean minus 3.2 to the left.  You find your z-score by taking the number of years they are asking you to look at, which is 6, subtract from that the mean, which is 8, then divide the whole mess by the standard deviation, which is 3.2

imstuck · Answer

|dw:1409674986965:dw|