At another local coffee shop, wait times for a cup of plain coffee are normally distributed with a mean of 125 seconds and a standard deviation of 22 seconds.
a. What percentage of wait times for a cup of plain coffee are less than 90 seconds? Round the percentage to two decimal places.
%
b. What percentage of wait times for a cup of plain coffee are greater than 125 seconds?
%
c. What percentage of wait times for a cup of plain coffee are between 90 seconds and 125 seconds? Round your answer to two decimal places.
%
d. On a particular day, 200 people waited for a plain cup of coffee. How many of them would we expect to have waited between 90 seconds and 125 seconds to get their coffee? Round to the nearest whole number.
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