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Q3. A box contains 7 blue balls and 8 red balls. A random sample of 4 balls is drawn from the box. What is the

Q3. A box contains 7 blue balls and 8 red balls. A random sample of 4 balls is drawn from the box. What is the probability that exactly 3 of the balls are blue? Find the expected value and variance of the number of blue balls when four balls are drawn together.

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