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Mathematics, 13.03.2020 17:31 dallisryan
After measuring the duration of many telephone calls, the telephone company found their data was well-approximated by the density function p(x) = 0.4e^(−0.4x), where x is the duration of a call, in minutes.
a) What percentage of calls last between 4 and 5 minutes? (nearest tenth)
b)What percentage of calls last 4 minutes or less? (nearest tenth)
c)What percentage of calls last 4 minutes or more? (nearest tenth)
d)Express the cumulative distribution function in the form P(x) = { x<0
x greater than or equal to 0
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