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telephone calls arrive at an exchange have a poisson distribution at an average rate of one...

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Basic Math

telephone calls arrive at an exchange have a poisson distributionat an average rate of one every second. Find the probabilities ofthe following;
a. no calls arriving in a given five-second period
b. between four and six calls arriving in the five-secondperiod
c. there is atleast one call
d. there is at most one call

Answer & Explanation Solved by verified expert
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Here lambda 1 for every second a Here 5 and x 0    See Answer
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