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Mathematics, 01.09.2019 18:30 hannahbear16841

In a large sample of customer accounts. a utility company determined that the average numbers of days between when a bill gets sent out and when the payment was made is 10 with a standard deviation of 20 days. assume the data to be approximately bell shaped. approximately 95% of all customer accounts have the average number of days between two values a and b. what is the value of b?

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