4) If there is a 25% chance of a spinner landing on blue. In 20 trials a) What is the expected value? [K/1] b) What is the probability of that number of success occurring? (Solve the probability of a) [T/2]

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A:

Q: In a large population, 5% are infected with a certain disease. If you take a random sample of 30,…

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A:

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A: This problem can be solved using Poisson distribution.

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Q: What is the expected value of X²?

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