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Arrivals to a bank automated teller machine(ATM) are distributed according to a Poisson distribution with a mean equal to two per 10 minutes.

Complete parts a and b below.

a. Determine the probability that in a given 10-minute segment, nocustomers will arrive at the ATM.

The probability is ....................(Round to four decimal places asneeded.)

b. What is the probability that fewer than two customers will arrive in a 20-minute segment?

The probability is............... (Round to four decimal places asneeded.)