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

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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.
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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