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Suppose an average of 1 0 0 service calls arrive during a business day, service call arrivals are independent events, calls never occur simultaneously, and

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Suppose an average of 100 service calls arrive during a business day, service call arrivals are independent events, calls never occur simultaneously, and the average rate is constant throughout the business day.
About what percentage of business days will the number of service calls be between 95 and 105?(Enter the nearest percentage.)

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