The numbers of hours worked (per week) by 500 statistics students are shown below. What is the percentage of students who work at least 20 hours per week? Number of hours Frequency 000 0 70% 95% 40% 30% Question 7 0-9 10-19 20-29 30-39 25 125 200 150
The numbers of hours worked (per week) by 500 statistics students are shown below. What is the percentage of students who work at least 20 hours per week? Number of hours Frequency 000 0 70% 95% 40% 30% Question 7 0-9 10-19 20-29 30-39 25 125 200 150
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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![**The numbers of hours worked (per week) by 500 statistics students are shown below. What is the percentage of students who work at least 20 hours per week?**
| Number of hours | Frequency |
|-----------------|-----------|
| 0–9 | 25 |
| 10–19 | 125 |
| 20–29 | 200 |
| 30–39 | 150 |
**Options:**
- 70%
- 95%
- 40%
- 30%
**Explanation:**
To determine the percentage of students who work at least 20 hours per week, add the frequencies of the groups working 20–29 hours and 30–39 hours:
\[ 200 (20–29 hours) + 150 (30–39 hours) = 350 \text{ students} \]
Next, to calculate the percentage:
\[ \left(\frac{350}{500}\right) \times 100 = 70\% \]
So, the correct answer is:
- 70%](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F49b6872f-8540-4d67-8f44-b13749eac041%2F367a224a-9b8d-4571-a647-7749b77e8778%2Fx1v45e_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**The numbers of hours worked (per week) by 500 statistics students are shown below. What is the percentage of students who work at least 20 hours per week?**
| Number of hours | Frequency |
|-----------------|-----------|
| 0–9 | 25 |
| 10–19 | 125 |
| 20–29 | 200 |
| 30–39 | 150 |
**Options:**
- 70%
- 95%
- 40%
- 30%
**Explanation:**
To determine the percentage of students who work at least 20 hours per week, add the frequencies of the groups working 20–29 hours and 30–39 hours:
\[ 200 (20–29 hours) + 150 (30–39 hours) = 350 \text{ students} \]
Next, to calculate the percentage:
\[ \left(\frac{350}{500}\right) \times 100 = 70\% \]
So, the correct answer is:
- 70%
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