Solution) A statistical analysis of 1,000 long-distance telephone calls made from the headquarters of the B
Question: 11 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 a mean of 240 seconds and a standard deviation of 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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