statistics
posted by Sandra .
2. The results of a recent survey indicate that the average new car costs $23,000, with a standard deviation of $3,500. The price of cars is normally distributed.
a. What is a Z score for a car with a price of $ 33,000?
b. What is a Z score for a car with a price of $30,000?
c. At what percentile rank is a car that sold for $30,000?

a and b. Z = (scoremean)/SD
c. Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.