21. The number of parking tickets issued in a certain city on any given weekday has a...

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21. The number of parking tickets issued in a certain city on any given weekday has a Poisson distribution with parameter l  50. What is the approximate probability that

a. Between 35 and 70 tickets are given out on a particular day? (Hint: When l is large, a Poisson rv has approximately a normal distribution.)

b. The total number of tickets given out during a 5-day week is between 225 and 275?

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