please solve in detail

In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell-shaped and has a mean of 57 and a standard deviation of 8. Using the empirical rule (as presented in the book), what is the approximate percentage of daily phone calls numbering between 49 and 65? Do not enter the percent symbol. ans = % Enter an integer or decimal number [more..] Question Help: Message instructor Submit