Exhibit 2-1 the numbers of hours worked (per week) by 400 statistics students are shown below. number of hours frequency 0x10 20 10x20 80 20x30 200 30x40 100 refer to exhibit 2-1. the percentage of students working between 10 and 20 hours is
a. 80%
b. 20%
c. 25%
d. 75%

b. 20%

Step-by-step explanation:

The distribution of  number of hours worked by students is:

0 - 10          =         20

10 - 20        =         80

20 - 30       =         200

30 - 40       =         100

Total number of students = 400

We need to find the percentage of students working between 10 and 20 hours. From the above table we can see that number of students working between 10 and 20 hours is 80. Now we need to convert this into percentage. What we need to evaluate is what percentage of 400 is 80.

The formula for percentage is:

Concerned value is 80, total value is 400. So using these in the formula we get:

Thus, 20% of the students are working between 10 and 20 hours.

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