Question

A comittee of 10 will be chosen at random from a group of 50, consisting of 30 boys and 25 girls. Let random variable x= number of boys in a group. What is the mean and variance of x? Show your solution

Answer 1

Answer:

StSuppose a variable X can take the values 1, 2, 3, or 4. The probability that X is equal to 2 or 3 is the sum of the two probabilities: P(X = 2 or X = 3) = P(X = 2) + P(X = 3) = 0.3 + 0.4 = 0.7. Similarly, the probability that X is greater than 1 is equal to 1 - P(X = 1) = 1 - 0.1 = 0.9, by the complement rule.

ep-by-step explanation:

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