Arrivals to a Bank Automated Teller Machine (ATM) Are Distributed

question 77

Multiple Choice

Arrivals to a bank automated teller machine (ATM) are distributed according to a Poisson distribution with a mean equal to three per 15 minutes. What is the probability that fewer than four customers will arrive in a 30-minute segment?

• A) 0.1512
• B) 0.1889
• C) 0.2515
• D) 0.2576

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