Question: need help with question. Thanks in advance in a mid-size company, The distribution of the number of phone calls answered each day by each of

need help with question. Thanks in advance

in a mid-size company, The distribution of the number of phone calls answered each day by each of the 12 receptionist is bell shaped and has a mean of 45 and a standard deviation of 9. Using the empirical rule as presented in the book, what is the approximate percentage of daily phone calls number in between 36 and 54

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