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QUESTION 13 A machine is set to pump cleanser into a process at the rate of 9 gallons per minute. Upon inspection, it is learned that the machine actually pumps cleanser at a rate described by the uniform distribution over the interval 8.5 to 11.5 gallons per minute. Find the standard deviation of cleansing time. Answer to 3 decimal places. QUESTION 14 Tblephone calls arrive at the information desk of a large computer software company at a rate of 25 per hour. What is the probability that the next call will arrive within 6 minutes? Answer to 4 decimal places. QUESTION 15 Customers arrive at the drive-up window of a fast-food restaurant with a mean of 7 per minute. What is the probability that the next customer arrives in more than 15 seconds? Answer to 4 decimal places. QUESTION 16 Find the probability that you would get greater than 2 = 2.73. Answer to 3 decimal places. QUESTION 17 What is the z score that would cut off the top 3% of all scores? Answer to 2 decimal places. QUESTION 7 Use the standard normal distribution to nd P{-2.25