Answer:
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:
[tex]\frac{\text{Concerned Value}}{\text{Total Value}} \times 100\%[/tex]
Concerned value is 80, total value is 400. So using these in the formula we get:
[tex]\frac{80}{400} \times 100%\\\\ = 20\%[/tex]
Thus, 20% of the students are working between 10 and 20 hours.
