Question 7

Ages	Number of students
15-18	8
19-22	7
23-26	3
27-30	2
31-34	2
35-38	2

Find the relative frequency for the class with lower class limit 19 Relative Frequency =_______ % Give your answer as a percent, rounded to two decimal places

Question 8

A Frequency Distribution Table using data This list of 16 random numbers has been sorted:

20

20

24

26

27

35

36

41

42

44

47

49

49

53

54

55

Fill in this table with the frequencies as whole numbers and the relative frequencies as decimals with4 decimal placesfor the relative frequencies. Remember: relative frequencies are between 0.0 and 1.0

(This problem does not accept fractions.)

Class	Frequency	Rel.Freq
20-29
30-39
40-49
50-59

Question 9

Here is a random sample of the body temperature of 25 young adults.

96.7	96.8	97	97.4	97.4
97.4	97.5	97.5	97.5	97.6
97.6	97.7	97.7	97.7	97.7
97.9	98	98	98.4	98.4
98.4	98.4	98.6	98.6	99

Complete the relative frequency distribution table.

Temperature Group	Frequency	Relative Frequency	Cumulative
96.7 x < 97.03	3	3/25	$$
97.03 x < 97.36	0	0/25	$$
97.36 x < 97.69	8	8/25	$$
97.69 x < 98.02	7	7/25	$$
98.02 x < 98.35	0	0/25	$$
98.35 x < 98.68	6	6/25	$$
98.68 x < 99.01	1	1/25	$$

Question 10

Suppose that 65 students were asked how many courses they were taking this semester. The (incomplete) results are shown below. Fill in the blank cells to complete the table. Round the relative frequencies to the nearest tenth.

Number of Courses	Frequency	Relative Frequency
1	15	0.2
2	17
3

Question 11

50 part-time students were asked how many courses they were taking this term. The (incomplete) results are shown below:

# of Courses	Frequency	Relative Frequency	Cumulative Frequency
1	16	0.32
2	14
3

a. Complete the table. b. What percent of students take exactly three courses?___________ %

Question 12

70 adults with gum disease were asked the number of times per week they used to floss before their diagnoses. The (incomplete) results are shown below:

# of times floss per week	Frequency	Relative Frequency	Cumulative Frequency
0	14		14
1	7	0.1	21
2		0.0857	27
3	7	0.1	34
4	7	0.1	41
5	10	0.1429	51
6	5	0.0714	56
7	14	0.2

a. Complete the table (Use 4 decimal places when applicable)

b. What is the cumulative relative frequency for flossing 2 times per week?______ %