A sample of the salaries of assistant professors on the business faculty at a local university revealed a mean income of $138,000 with a standard deviation of $9,600. Assume that salaries follow a bell-shaped distribution. Use the empirical rule to answer the following questions.

a. Approximately what percentage of the salaries fall between $128,400 and $147,600?

b. Approximately what percentage of the salaries fall between $118,800 and $157,200?

c. Approximately what percentage of the salaries are greater than $157,200?