construct a frequency distribution and a relative - frequency histogram for the data set using five classes…

construct a frequency distribution and a relative - frequency histogram for the data set using five classes. which class has the greatest relative frequency and which has the least relative frequency? ratings from 1 (lowest) to 10 (highest) from 36 taste testers 2 5 9 3 9 9 6 10 6 6 8 6 6 9 2 4 10 4 3 6 4 5 6 2 3 9 2 9 4 4 6 6 1 9 4 2 construct a frequency distribution for the data using five classes. class frequency
Answer
Explanation:
Step1: Find the range
The smallest value in the data - set is 1 and the largest is 10. Range = Max - Min = 10 - 1=9.
Step2: Determine the class width
We want 5 classes. Class width $w=\lceil\frac{Range}{Number\ of\ classes}\rceil=\lceil\frac{9}{5}\rceil = 2$.
Step3: Define the classes
The classes will be 1 - 2, 3 - 4, 5 - 6, 7 - 8, 9 - 10.
Step4: Count the frequencies
For the class 1 - 2: Count the number of 1s and 2s in the data - set. There are 7. For the class 3 - 4: Count the number of 3s and 4s. There are 10. For the class 5 - 6: Count the number of 5s and 6s. There are 11. For the class 7 - 8: Count the number of 7s and 8s. There are 2. For the class 9 - 10: Count the number of 9s and 10s. There are 6. The frequency distribution table is:
| Class | Frequency |
|---|---|
| 1 - 2 | 7 |
| 3 - 4 | 10 |
| 5 - 6 | 11 |
| 7 - 8 | 2 |
| 9 - 10 | 6 |
Step5: Calculate relative frequencies
Relative frequency of a class $=\frac{Frequency\ of\ the\ class}{Total\ frequency}$. Total frequency = 7 + 10+11 + 2+6=36. For the class 1 - 2: Relative frequency $=\frac{7}{36}\approx0.194$. For the class 3 - 4: Relative frequency $=\frac{10}{36}\approx0.278$. For the class 5 - 6: Relative frequency $=\frac{11}{36}\approx0.306$. For the class 7 - 8: Relative frequency $=\frac{2}{36}\approx0.056$. For the class 9 - 10: Relative frequency $=\frac{6}{36}\approx0.167$.
The class with the greatest relative frequency is 5 - 6 and the class with the least relative frequency is 7 - 8.
Answer:
| Class | Frequency |
|---|---|
| 1 - 2 | 7 |
| 3 - 4 | 10 |
| 5 - 6 | 11 |
| 7 - 8 | 2 |
| 9 - 10 | 6 |
| The class with the greatest relative frequency is 5 - 6. The class with the least relative frequency is 7 - 8. |