According to flightstats.com, American Airlines flights from Dallas to Chicago are on time 80% of the time. Suppose 24 flights are randomly selected, and the number of on-time flights is recorded. (a) Explain why this is a binomial experiment. (b) Determine the values of n and p. (c) Find and interpret the probability that exactly 15 flights are on time. (d) Find and interpret the probability that fewer than 15 flights are on time.

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### Binomial Experiment Analysis

According to flightstats.com, American Airlines flights from Dallas to Chicago are on time 80% of the time. Suppose 24 flights are randomly selected, and the number of on-time flights is recorded.

**(a) Explain why this is a binomial experiment.**

The scenario described is a binomial experiment because:

- **Fixed Number of Trials**: There are 24 flights, which is a fixed number.
- **Two Possible Outcomes**: Each flight can either be on time or not on time.
- **Independent Trials**: The on-time status of one flight does not affect another.
- **Constant Probability**: Each flight has an 80% probability of being on time.

**(b) Determine the values of n and p.**

- **n (Number of Trials)**: 24
- **p (Probability of Success)**: 0.8 (80% probability of a flight being on time)

**(c) Find and interpret the probability that exactly 15 flights are on time.**

To find the probability of exactly 15 flights being on time, use the binomial probability formula:

\[ P(X = k) = \binom{n}{k} p^k (1-p)^{n-k} \]

For 15 flights:
- \( n = 24 \)
- \( k = 15 \)
- \( p = 0.8 \)

The value can be computed to determine the probability.

**(d) Find and interpret the probability that fewer than 15 flights are on time.**

To find the probability that fewer than 15 flights are on time, sum the probabilities of observing 0 to 14 on-time flights.

\[ P(X < 15) = \sum_{k=0}^{14} P(X = k) \]

This involves calculating the sum of individual probabilities from \( P(X = 0) \) to \( P(X = 14) \). These values can be calculated using the binomial formula for each \( k \) and then summed to find the total probability.
Transcribed Image Text:### Binomial Experiment Analysis According to flightstats.com, American Airlines flights from Dallas to Chicago are on time 80% of the time. Suppose 24 flights are randomly selected, and the number of on-time flights is recorded. **(a) Explain why this is a binomial experiment.** The scenario described is a binomial experiment because: - **Fixed Number of Trials**: There are 24 flights, which is a fixed number. - **Two Possible Outcomes**: Each flight can either be on time or not on time. - **Independent Trials**: The on-time status of one flight does not affect another. - **Constant Probability**: Each flight has an 80% probability of being on time. **(b) Determine the values of n and p.** - **n (Number of Trials)**: 24 - **p (Probability of Success)**: 0.8 (80% probability of a flight being on time) **(c) Find and interpret the probability that exactly 15 flights are on time.** To find the probability of exactly 15 flights being on time, use the binomial probability formula: \[ P(X = k) = \binom{n}{k} p^k (1-p)^{n-k} \] For 15 flights: - \( n = 24 \) - \( k = 15 \) - \( p = 0.8 \) The value can be computed to determine the probability. **(d) Find and interpret the probability that fewer than 15 flights are on time.** To find the probability that fewer than 15 flights are on time, sum the probabilities of observing 0 to 14 on-time flights. \[ P(X < 15) = \sum_{k=0}^{14} P(X = k) \] This involves calculating the sum of individual probabilities from \( P(X = 0) \) to \( P(X = 14) \). These values can be calculated using the binomial formula for each \( k \) and then summed to find the total probability.
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here p = American  Airlines flights from Dallas to Chicago are on time =0.80n=  24 flights are randomly selected x= the number of on-time flights is recorded  

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