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In a sample of 800 U.S. adults, 198 think that most celebrities are good role models. Two U S. adults are selected from this sample without replacement. Complete parts (a) through (c). (a) Find the probability that both adults think most celebrities are good role models. The probability that both adults think most celebrities are good role models is (Round to three decimal places as needed.)

Ask by Schwartz Wagner. in the United States
Feb 25,2025

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The probability that both adults think most celebrities are good role models is approximately 0.061.

Solución

We are given that in a sample of 800 U.S. adults, 198 believe that most celebrities are good role models. When two adults are selected without replacement, the probability that both selected adults have that view can be found as follows: Step 1. The probability that the first adult thinks celebrities are good role models is 198/800. Step 2. After choosing one adult who thinks so, there are now 197 such adults left out of 799 total adults. So the probability that the second adult also thinks so is 197/799. Multiply these together for the joint probability:   (198/800) × (197/799) Calculating this product:   (198/800) × (197/799) ≈ 0.2475 × 0.2466 ≈ 0.061 Thus, the probability that both adults think that most celebrities are good role models is approximately 0.061 (rounded to three decimal places).

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To find the probability that both selected adults think that most celebrities are good role models, we need to consider the number of adults who believe this and the decreasing population as we select without replacement. There are 198 adults who think celebrities are good role models out of a total of 800. 1. The probability that the first adult selected thinks celebrities are good role models is: \[ P(A) = \frac{198}{800} \] 2. If the first selected adult thinks so, now there are 197 good role model supporters left out of 799 total adults. So, the probability that the second adult selected also thinks so is: \[ P(B|A) = \frac{197}{799} \] 3. Now, we multiply these probabilities to find the overall probability that both selected adults think most celebrities are good role models: \[ P(A \text{ and } B) = P(A) \times P(B|A) = \frac{198}{800} \times \frac{197}{799} \] 4. Doing the math: \[ P(A \text{ and } B) = \frac{198 \times 197}{800 \times 799} = \frac{39006}{638400} \approx 0.061 \] When rounded to three decimal places, the probability that both adults think most celebrities are good role models is approximately **0.061**.

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