Solved: After measuring the duration of many telephone calls, the telephone company
Chapter 8, Problem 21(choose chapter or problem)
After measuring the duration of many telephone calls, the telephone company found their data was well approximated by the density function p(x)=0.4e0.4x, where x is the duration of a call, in minutes. (a) What percentage of calls last between 1 and 2 minutes? (b) What percentage of calls last 1 minute or less? (c) What percentage of calls last 3 minutes or more? (d) Find the cumulative distribution function.
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