Please help.

In a mid-size company in Pittsburgh, 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 42 and a standard deviation of 7. Using the empirical (68-95-99.7) rule, what is the approximate percentage of daily phone calls numbering between 35 and 49?

Answer = % . (Enter your answer as a percent, but do not enter the percent symbol. Do not enter in decimal form or round your answer. For example, enter 93.8 for 93.8%, not 0.939)