The one-way commuting times from home to work for all employees working at a large company have a mean of 34 minutes and a standard deviation of 8 minutes.
a. Using Chebyshev’s theorem, find the minimum percentage of employees at this company who have one-way commuting times in the following intervals.
i. 14 to 54 minutes     

ii. 18 to 50 minutes
b. Using Chebyshev’s theorem, find the interval that contains one-way commuting times of at least 89% of the employees at this company.