Question: The time customers are on hold when ringing the IT help line for a certain ISP provider is normally distributed with a mean of 20

The time customers are on hold when ringing the IT help line for a certain ISP provider is normally distributed with a mean of 20 minutes and a standard deviation of 10 minutes.

a. What proportion of customers are on hold for more than 40 minutes?

b. What is the probability that a customer is on hold for less than 30 minutes?

c. What percentage of calls are answered within 10 minutes?

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