During lunchtime, customers arrive at Bob's Drugs according to a Poisson distribution with $\lambda$ = 4 per minute.
a. During a one minute interval, determine the following probabilities: (1) no arrivals; (2) one arrival; (3) two arrivals; and, (4) three or more arrivals.
b. What is the probability of two arrivals in a two-minute period?

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The Answer of During lunchtime, customers arrive at Bob's Drugs according to a Poisson distribution with $\lambda$ = 4 per minute.
a. During a one minute interval, determine the following probabilities: (1) no arrivals; (2) one arrival; (3) two arrivals; and, (4) three or more arrivals.
b. What is the probability of two arrivals in a two-minute period?

During Lunchtime, Customers Arrive at Bob's Drugs According to a Poisson