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a-1. What is the rate parameter ?? (Round your answer to 4 decimal places.)
Rate parameter ?
a-2. What is the standard deviation of this distribution? (Round your answer to 1 decimal place.)
Jack wants to take a seven-minute break. He believes that if he goes right after he has serviced a customer, he will lower the probability of someone showing up during his seven-minute break. Is he right in this belief?
What is the probability that a customer will show up in less than seven minutes? (Round intermediate calculations to 4 decimal places and final answer to 4 decimal places.)
What is the probability that nobody shows up for over half an hour? (Round intermediate calculations to 4 decimal places and final answer to 4 decimal places.)