The time it takes an international telephone operator to, Ask an Expert

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The time it takes an international telephone operator to place an overseas phone call is normally distributed with mean 45 seconds and standard deviation 10 seconds.

a. What is the probability that my call will go through in less than 1 minute?

b. What is the probability that I will get through in less than 40 seconds?

c. What is the probability that I will have to wait more than 70 seconds for my call to go through?

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