2.2) The average price of cell phones manufactured by Ahmadi, Inc. is $100 with a standard deviation of $10. Furthermore, it is known that the prices of the cell phones manufactured by Ahmadi are...

2.2) The average price of cell phones manufactured by Ahmadi, Inc. is $100 with a standard deviation of $10. Furthermore, it is known that the prices of the cell phones manufactured by Ahmadi are normally distributed.

a) Suppose cell phones manufactured by Ahmadi, Inc. are used in a test. Find the probability that exactly two of the three cell phones have prices less than $100.