Problem

Approximately 1 in 12 males of a certain ethnic descent has red-green color blindness. Suppose a group of 20 males of this descent is randomly chosen. Let random variable $X=$ the number of men in the group who have red-green color blindness. a) Find $P(X=3)$. What does this number represent? b) Find $P(X \geq 2)$. What does this number represent? c) Find $(3 \leq X \leq 6)$. What does this number represent? d) Find $\mu$ and $P(X=\mu)$. What do these numbers represent? a) What is the correct formula to use to find $P(X=3)$ ? \[ P(X=3)=\left(\frac{\square}{\square}\right) \cdot\left(\frac{1}{12}\right)^{\square} \cdot \square \square \text { (Simplify your answers.) } \] $P(X=3)=\square$, which is the probability that $\square$ males are color-blind. (Type an integer or decimal rounded to three decimal places as needed.) b) $P(X \geq 2)=\square$, which is the probability that $\square$ males are color-blind. (Type an integer or decimal rounded to three decimal places as needed.) c) $P(3 \leq X \leq 6)=\square$, which is the probability that males are color-blind. (Type an integer or decimal rounded to three decimal places as needed.) d) $\mu=\square$, where $\mu$ is the (Type an integer or decimal rounded to three decimal places as needed.) $P(X=\mu)=\square$, which is the probability that $\square$ males of the ethnic origin are color-blind. (Type an integer or decimal rounded to three decimal places as needed.) Next

Solution

Step 1 :Define the parameters of the binomial distribution: the number of trials \(n = 20\) and the probability of success \(p = 1/12\).

Step 2 :Calculate the probability \(P(X=3)\) using the binomial probability formula: \(P(X=3) = \binom{n}{k} \cdot (p^k) \cdot ((1-p)^{n-k})\), where \(k = 3\). The result is approximately 0.150.

Step 3 :This number represents the probability that exactly 3 males in the group are color-blind.

Step 4 :Calculate the probability \(P(X \geq 2)\) by summing the binomial probabilities for \(k\) from 2 to \(n\). The result is approximately 0.505.

Step 5 :This number represents the probability that at least 2 males in the group are color-blind.

Step 6 :Calculate the probability \(P(3 \leq X \leq 6)\) by summing the binomial probabilities for \(k\) from 3 to 6. The result is approximately 0.229.

Step 7 :This number represents the probability that between 3 and 6 males in the group are color-blind.

Step 8 :Calculate the expected value \(\mu\) of the binomial distribution using the formula \(\mu = n \cdot p\). The result is approximately 1.667.

Step 9 :\(\mu\) represents the expected number of males who are color-blind in the group.

Step 10 :Calculate the probability \(P(X=\mu)\) using the binomial probability formula. Since \(\mu\) is not an integer, round it to the nearest integer before calculation. The result is approximately 0.319.

Step 11 :This number represents the probability that approximately 2 males of the ethnic origin in the group are color-blind.

Step 12 :Final Answer: a) \(P(X=3)=\boxed{0.150}\), which is the probability that 3 males are color-blind. b) \(P(X \geq 2)=\boxed{0.505}\), which is the probability that at least 2 males are color-blind. c) \(P(3 \leq X \leq 6)=\boxed{0.229}\), which is the probability that between 3 and 6 males are color-blind. d) \(\mu=\boxed{1.667}\), where \(\mu\) is the expected number of males who are color-blind. \(P(X=\mu)=\boxed{0.319}\), which is the probability that approximately 2 males of the ethnic origin are color-blind.

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