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Partiol3 Part 1 of 3 Find the probability that a tutor sees 8 students in an hour. Round your answer to three decimal places. The probability that a tutor sees 8 students in an hour is \( \square \) .

Ask by Welch Wyatt. in the United States
Mar 02,2025

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Answer

The probability that a tutor sees 8 students in an hour is 0.140.

Solution

We use the Poisson probability formula which is   P(X = k) = (e^(–λ) · λ^k) / k! Here k is the number of students (8 in this case) and λ is the mean number of students seen per hour. Assuming that the tutor sees an average of 8 students per hour (λ = 8), then the probability that exactly 8 students are seen in an hour is   P(X = 8) = (e^(–8) · 8^8) / 8! Calculating step‐by‐step: 1. 8^8 = 16,777,216 2. 8! = 40,320 3. e^(–8) is approximately 0.00033546 Now multiply and divide:   P(X = 8) = (0.00033546 × 16,777,216) / 40,320        ≈ (5628.59) / 40,320        ≈ 0.1396 Rounded to three decimal places, the probability is 0.140. Thus, the answer is 0.140.

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To find the probability that a tutor sees 8 students in an hour, we can use the Poisson distribution. The formula for the Poisson probability is: \[ P(X = k) = \frac{\lambda^k e^{-\lambda}}{k!} \] where \( k \) is the number of events (students seen), \( \lambda \) is the average rate of events per interval (students seen per hour), and \( e \) is Euler's number (approximately 2.71828). Assuming the average rate of students seen by the tutor per hour is known (let’s say it’s 6 students/hour for this example), we plug in the values: - \( k = 8 \) - \( \lambda = 6 \) Using the formula, we calculate: \[ P(X = 8) = \frac{6^8 e^{-6}}{8!} \] Calculating \( 6^8 \), \( e^{-6} \), and \( 8! \): - \( 6^8 = 1679616 \) - \( e^{-6} \approx 0.002478752 \) - \( 8! = 40320 \) Now, substituting these values into the probability formula: \[ P(X = 8) = \frac{1679616 \times 0.002478752}{40320} \] Calculating this gives: \[ P(X = 8) \approx 0.098 \] Therefore, the probability that a tutor sees 8 students in an hour is approximately **0.098** when rounded to three decimal places.

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