A novel on the Amazon.com web site has the following ratings, in number of stars, from reviewers: Number of Stars Frequency 1 7 2 4 3 20 4 9 5 10 What is the probability that a randomly selected review is more than 3 stars? O 0.21 O 0.38 O 0.55 1
A novel on the Amazon.com web site has the following ratings, in number of stars, from reviewers: Number of Stars Frequency 1 7 2 4 3 20 4 9 5 10 What is the probability that a randomly selected review is more than 3 stars? O 0.21 O 0.38 O 0.55 1
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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A novel on the Amazon.com web site has the following ratings, in number of stars, from reviewers:
What is the probability that a randomly selected review is more than 3 stars?
![A novel on the Amazon.com website has the following ratings, in number of stars, from reviewers:
| Number of Stars | Frequency |
|-----------------|-----------|
| 1 | 7 |
| 2 | 4 |
| 3 | 20 |
| 4 | 9 |
| 5 | 10 |
What is the probability that a randomly selected review is more than 3 stars?
- 0.21
- 0.38
- 0.55
- 1
To calculate the probability that a randomly selected review is more than 3 stars, we focus on the frequencies of 4 and 5 stars.
1. Number of reviews with more than 3 stars:
- 4 stars: 9
- 5 stars: 10
- Total = 9 + 10 = 19
2. Total number of reviews:
- 1 star: 7
- 2 stars: 4
- 3 stars: 20
- 4 stars: 9
- 5 stars: 10
- Total = 7 + 4 + 20 + 9 + 10 = 50
3. Probability:
\[
\text{Probability} = \frac{\text{Number of reviews more than 3 stars}}{\text{Total number of reviews}} = \frac{19}{50} = 0.38
\]
Thus, the probability that a randomly selected review is more than 3 stars is 0.38.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9223ea23-55f5-4b8a-b038-fb4c0f30d8b0%2F9da75f36-c1ce-450d-bc26-e5324d400e9f%2F2rh5z7d_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A novel on the Amazon.com website has the following ratings, in number of stars, from reviewers:
| Number of Stars | Frequency |
|-----------------|-----------|
| 1 | 7 |
| 2 | 4 |
| 3 | 20 |
| 4 | 9 |
| 5 | 10 |
What is the probability that a randomly selected review is more than 3 stars?
- 0.21
- 0.38
- 0.55
- 1
To calculate the probability that a randomly selected review is more than 3 stars, we focus on the frequencies of 4 and 5 stars.
1. Number of reviews with more than 3 stars:
- 4 stars: 9
- 5 stars: 10
- Total = 9 + 10 = 19
2. Total number of reviews:
- 1 star: 7
- 2 stars: 4
- 3 stars: 20
- 4 stars: 9
- 5 stars: 10
- Total = 7 + 4 + 20 + 9 + 10 = 50
3. Probability:
\[
\text{Probability} = \frac{\text{Number of reviews more than 3 stars}}{\text{Total number of reviews}} = \frac{19}{50} = 0.38
\]
Thus, the probability that a randomly selected review is more than 3 stars is 0.38.
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