The checkout time of a supermarket cashier follows an exponential distribu- tion, and the mean checkout...
The checkout time of a supermarket cashier follows an
exponential distribu-
tion, and the mean checkout time is three minutes.
(a) What is the probability that a checkout time exceeds 2
minutes?
(b) If 10 of these checkout times are selected, what is the
probability that
at most 3 checkout times that is less than 2 minutes?
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