The average amount of rainfall in Puerto Rico last month was 3.5 inches, according to the National Meteorology Center. Suppose that a normal distribution can be used and that the standard deviation is 0.8 inches. a) What percentage of the time was last month's rainfall greater than 5 inches?  b) What percentage of the time was rainfall less than 3 inches?  c) A month is considered extremely humid if the rainfall is 10% higher for that month. How much rainfall must be in April to be considered an extremely humid month?

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The average amount of rainfall in Puerto Rico last month was 3.5 inches, according to the National Meteorology Center. Suppose that a normal distribution can be used and that the standard deviation is 0.8 inches.

a) What percentage of the time was last month's rainfall greater than 5 inches? 
b) What percentage of the time was rainfall less than 3 inches? 
c) A month is considered extremely humid if the rainfall is 10% higher for that month. How much rainfall must be in April to be considered an extremely humid month? 

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