A sample of the salaries of assistant professors on the business faculty at a local university revealed a mean income of $100,000 with a standard deviation of $10,000. 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 $90,000 and $110,000?

b-Approximately what percentage of the salaries fall between $80,000 and $120,000?

c-Approximately what percentage of the salaries are greater than $120,000?