Suppose students walk into the library at Fresno State accordingto a Poisson
process of rate seven per hour. What is the probability thatexactly five students enter the
library in the two-hour period of time between

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(a) 2:00pm and 4:00pm (one continuous two-hour period)?

(b) 1:00pm and 2:00pm or between 3:00pm and 4:00pm (two separateone-hour periods that
total two hours)?