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Question 2 A statistical analysis of 1000 long-distance telephone calls made from the headquarters of the...

Question 2
A statistical analysis of 1000 long-distance telephone calls made from the headquarters of the ABC company indicates that the length of these calls is normally distributed with population mean is 140 seconds and standard deviation is 25 seconds.
a) What is the probability that a call lasted at least 100 seconds
b) What is the probability that a particular call lasted between 110 and 130 seconds c) What is the length of a particular call if only 2% of all calls are shorter?
Math   Advanced-Math   
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