HELPPPPPP ME PLEASE

Question

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 43 and a standard deviation of 9. Using the empirical rule, what is the approximate percentage of daily phone calls numbering between 34 and 52?

Answer 1

mean 43, sd 9

% between 52 and 34

= 68%

it's 1 sd below and 1 sd above

by the empirical rule 68% lie within 1 standard deviation from the mean

(52-43)/9 = 9/9 = 1

(43-34)/9 = 9/9 = 1