Question

The average wait-time at Dutch Brothers is 195 seconds with standard deviation of 30 seconds. a....

The average wait-time at Dutch Brothers is 195 seconds with standard deviation of 30 seconds.

a. If X = average wait-time at Dutch Brothers, then X ~ _____(_____,_____)

b. What is the probability that a customer’s wait time is less than 120 seconds? (round to 4 decimal places)

c. What is the probability that a customer’s wait time is between 180 and 240 seconds. (round to 4 decimal places)

d. What is the 90th percentile of wait times? (Round to 1 decimal place)

Math   Statistics-And-Probability   
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