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The probability is 0.80 that a person of age 20 years will be alive at age 65 years. Suppose that 500 people of age 20

The probability is 0.80 that a person of age 20 years will be alive at age 65 years. Suppose that 500 people of age 20 are selected at random. Determine the probability that a. exactly 390 of them will be alive at age 65. b. between 375 and 425 of them, inclusive, will be alive at age 65

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