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Mathematics, 07.10.2019 20:00 dri16947

The prevalence of blood types in the us population is o+: 37.4%, a+: 35.7%, b+: 8.5%, ab+: 3.4%, o–: 6.6%, a–: 6.3%, b–: 1.5%, and ab–: 0.6%. 1) a sample of 24 subjects is randomly selected from the us population. what is the probability that 8 subjects are a+. random variable x describes the number of a+ subjects among 24 selected. find ex and var x.

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