Hourly Wages (In $)	Number of employees
10 - 13	8
14 - 17	12
18 - 21	20
22 - 25	10

a) What is the percentage of the employees who have hourly wages of at least $18?

b)What is the percentage of the employees who have hourly wages less than $22?

c) How many observations are there?

d) Based on this sample, the president of the company said that "82% of all our employees' yearly incomes are $14 or more." What kind of statistical information does the president represent?