Consider the following data set:

	5.6		13.9		12.3		8.2		10.4		8.9		6.7		12.4		14.1		10.2
	3.1		11.8		13.1		6.6		13.9		6.7		11.4		12.4		12.9		7.2
	8.6		12.8		5.3		14.9		5.1		9.7		4.4		4.9		4.1		9.3

a. Construct the frequency distribution using classes of 3 up to 5, 5 up to 7, etc.

b. Construct relative frequency, cumulative frequency, and cumulative relative frequency distributions. (Round "Relative Frequency" and "Cumulative Relative Frequency" to 2 decimal places.)

c-1. How many of the observations are at least 7 but less than 9?

c-2. How many of the observations are less than 9?

d-1. What percentage of the observations are at least 7 but less than 9? (Round your answer to the nearest whole percent.)

d-2. What percentage of the observations are less than 9? (Round your answer to the nearest whole percent.)