The average price of cell phones manufactured by Ahmadi, Inc is 98 with a standard deviation of 12 . Furthermore, it is known that the prices of the cell phones manufactured by Ahmadi are normally distributed.
a. What percentage of cell phones produced by Ahmadi, Inc. will have prices of at least 120.20?
b. Cell phones with prices of at least 81.80 will get a free gift. What percentage of the cell phones will be eligible for the free gift?
c. What are the minimum and the maximum values of the middle 95 of cell phone prices?
d. If 7,218 of the Ahmadi cell phones were priced at least 119.00, how many cell phones were produced by Ahmadi, Inc.?
Question 2
In a regression analysis, the coefficient of determination is .4225 . The coefficient of correlation in this situation is
a. .65 if b1 is positive.
b. .1785.
c. -.18 if b1 is negative.
d. .4225.
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