The following frequency distribution reports the number of frequent flier miles, reported in thousands, for employees of Brumley Statistical Consulting Inc. during the most recent quarter.

Frequent Flier Miles (000)	Number of Employees
0 up to 6			5
6 up to 12			12
12 up to 18			25
18 up to 24			8
24 up to 30			2
Total			52

1. How many employees were studied?

2. What is the midpoint of the first class? (Round your answer to 1 decimal place.)

4. A frequency polygon is to be drawn. What are the coordinates of the plot for the third class? (Round your answer to 1 decimal place.)