(Answered) Question a statistical analysis of 1000 long-distance

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Question: A statistical analysis of 1,000 long-distance telephone calls made from the headquarters of the Bricks and Clicks Computer Corporation indicates that the length of these calls is normally distributed, with = 240 seconds and σ = 40 seconds.

a. What is the probability that a call lasted less than 180 seconds?

b. What is the probability that a call lasted between 180 and 300 seconds?

c. What is the probability that a call lasted between 110 and 180 seconds?

d. What is the length of a call if only 1% of all calls are shorter?

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