推 ll9935:對阿對阿 04/05 17:40
The time of travel from a person is apartment to
the bus station follow a uniform distribution over
the interval from 20 to 30 minut .
if he leaves home at 9:05 AM , what is the probability
that he will go to the station between 9:25 and 9:30 AM ?
What is the mean and variance of wating time ?
我算出來是 0.5 50/2 100/12 對嗎? 還是錯了?
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