The one-way commuting times from home to work for all employees working at a large company have a bell-shaped curve with a mean of 35 minutes and a standard deviation of 7 minutes. Using the empirical rule, find the approximate percentages of the employees at this company who have one-way commuting times in the following intervals.

a. 14 to 56 minutes

99.79590756865

%

b. 28 to 42 minutes

99.79590756865

%

c. 21 to 49 minutes

99.79590756865

%