Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.40) and its Z score. Insert data into equation above and solve.
The retail price of 12-pack soda can be characterized as having a normal distribution with a mean of 3.05 dollars and a standard deviation of 0.24. Below what price do you find 40 percent of all 12-packs?
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