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At a customer service call center for a large company, the number of calls received per hour is normally distributed with a mean of

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At a customer service call center for a large company, the number of calls received per hour is normally distributed with a mean of 180 calls and a standard deviation of 15 calls. What is the probability that during a given hour of the day there will be between 143 calls and 185 calls, to the nearest thousandth?

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