Pregunta
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Based on a survey, \( 37 \% \) of likely voters would be willing to vote by internet instead of the in-person traditional method of voting. For each of the following, assume that 14 likely voters are randomly selected. Complete parts (a) through (c) below. a. What is the probability that exactly 11 of those selected would do internet voting? (Round to five decimal places as needed.)

Ask by Newton Zimmerman. in the United States
Mar 10,2025

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The probability that exactly 11 out of 14 selected voters would vote by internet is approximately 0.00161.

Solución

We are given that the number of likely voters who would vote by internet follows a binomial distribution with parameters \[ n = 14 \quad \text{and} \quad p = 0.37. \] Let \( X \) be the number of individuals who would vote by internet. The probability mass function is \[ P(X=k) = \binom{n}{k} p^k (1-p)^{n-k}. \] For part (a), we need the probability that exactly 11 out of 14 selected voters would vote by internet voting. Thus, we substitute \( k = 11 \) and \( n = 14 \) into the formula: \[ P(X=11) = \binom{14}{11} (0.37)^{11} (0.63)^3. \] Step 1. Compute the combination: \[ \binom{14}{11} = \binom{14}{3} = \frac{14 \times 13 \times 12}{3 \times 2 \times 1} = 364. \] Step 2. Write the probability expression: \[ P(X=11) = 364 \times (0.37)^{11} \times (0.63)^3. \] Step 3. Evaluating the powers (using a calculator or appropriate software for precision): \[ (0.37)^{11} \approx 1.772 \times 10^{-5} \] \[ (0.63)^3 \approx 0.25005 \] Step 4. Combine the factors: \[ P(X=11) \approx 364 \times 1.772 \times 10^{-5} \times 0.25005 \approx 0.001611. \] Rounding to five decimal places, the probability is approximately \[ P(X=11) \approx 0.00161. \]

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Bonus Knowledge

To find the probability that exactly 11 out of 14 likely voters would choose to vote by internet, we can use the binomial probability formula: \[ P(X=k) = \binom{n}{k} p^k (1-p)^{n-k} \] Here, \(n = 14\) (the number of trials), \(k = 11\) (the number of successes), and \(p = 0.37\) (the probability of a success). First, we need to calculate the binomial coefficient: \[ \binom{14}{11} = \frac{14!}{11!(14-11)!} = \frac{14 \times 13 \times 12}{3 \times 2 \times 1} = 364 \] Now we substitute the values into the binomial formula: \[ P(X=11) = \binom{14}{11} (0.37)^{11} (1-0.37)^{14-11} \] Calculating each part: 1. \( (0.37)^{11} \approx 0.000027 \) 2. \( (0.63)^{3} \approx 0.250047 \) Now, putting it all together: \[ P(X=11) = 364 \times 0.000027 \times 0.250047 \approx 0.002459 \] Rounded to five decimal places, the probability that exactly 11 of those selected would do internet voting is: **0.00246**

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