The time between calls to a plumbing supply business is exponentially distributed with a mean time between calls of 14 minutes. (a) What is the probability that there are no calls within a 30-minute interval? (Round your answer to 4 decimal places.) (b) What is the probability that at least one call arrives within a 10-minute interval? (Round your answer to 4 decimal places.) (c) What is the probability that the first call arrives within 5 and 10 minutes after opening? (Round your answer to 4 decimal places.)

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A: 4.3+3.1-4 =?

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