According to the cellular telecommunication industry association, the average local monthly cell phone bill is $42.78. Suppose local monthly cell phone bills are normally distributed with standard deviation $11.35. (i)      What is the probability that a randomly selected sell phone bill is more than $67.75?    (ii)     What is the probability that a randomly selected cell phone bill is between $45 and $50?    (iii) Find the two points between which 75% of cell phones have their bills.                         (iv) Find a point above which 83% cell phone having their bills.

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According to the cellular telecommunication industry association, the average local monthly cell phone bill is $42.78. Suppose local monthly cell phone bills are normally distributed with standard deviation $11.35.

(i)      What is the probability that a randomly selected sell phone bill is more than $67.75?

   (ii)     What is the probability that a randomly selected cell phone bill is between $45 and $50?

   (iii) Find the two points between which 75% of cell phones have their bills.                       

 (iv) Find a point above which 83% cell phone having their bills.

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