Refer to Exhibit 2-1. The number of students who work 19 hours or less is

Exhibit 2-1

The number of hours worked (per week) by 400 statistics students are shown below.

Number of Hours Frequency
0 - 9 20
10 - 19 80
20 - 29 200
30 - 39 100

Refer to Exhibit 2-1. The number of students who work 19 hours or less is

a. 80
b. 100
c. 200
d. 400


Answer: b. 100

Refer to Exhibit 2-1. The percentage of students who work at least 10 hours per week is

Exhibit 2-1

The number of hours worked (per week) by 400 statistics students are shown below.

Number of Hours Frequency
0 - 9 20
10 - 19 80
20 - 29 200
30 - 39 100

Refer to Exhibit 2-1. The percentage of students who work at least 10 hours per week is

a. 50%
b. 5%
c. 95%
d. 100%


Answer: c. 95%

Refer to Exhibit 2-1. If a cumulative frequency distribution is developed for the above data, the last class will have a cumulative frequency of

Exhibit 2-1

The number of hours worked (per week) by 400 statistics students are shown below.

Number of Hours Frequency
0 - 9 20
10 - 19 80
20 - 29 200
30 - 39 100

Refer to Exhibit 2-1. If a cumulative frequency distribution is developed for the above data, the last class will have a cumulative frequency of

a. 100
b. 1
c. 30 - 39
d. 400


Answer: d. 400

Refer to Exhibit 2-1. The cumulative frequency for the class of 20 - 29

Exhibit 2-1

The number of hours worked (per week) by 400 statistics students are shown below.

Number of Hours Frequency
0 - 9 20
10 - 19 80
20 - 29 200
30 - 39 100

Refer to Exhibit 2-1. The cumulative frequency for the class of 20 - 29

a. is 200
b. is 300
c. is 0.75
d. is 0.5


Answer: b. is 300

Refer to Exhibit 2-1. The cumulative percent frequency for the class of 30 - 39 is

Exhibit 2-1

The number of hours worked (per week) by 400 statistics students are shown below.

Number of Hours Frequency
0 - 9 20
10 - 19 80
20 - 29 200
30 - 39 100

Refer to Exhibit 2-1. The cumulative percent frequency for the class of 30 - 39 is

a. 100%
b. 75%
c. 50%
d. 25%


Answer: a. 100%

Refer to Exhibit 2-1. The cumulative relative frequency for the class of 20 - 29

Exhibit 2-1

The number of hours worked (per week) by 400 statistics students are shown below.

Number of Hours Frequency
0 - 9 20
10 - 19 80
20 - 29 200
30 - 39 100

Refer to Exhibit 2-1. The cumulative relative frequency for the class of 20 - 29

a. is 300
b. is 0.25
c. is 0.75
d. is 0.5


Answer: c. is 0.75