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The ramdom variable X represents the annual salaries in dollars of a group of teachers. Given the following probabilities: P(30,000) = .5; P(40,000)...

The ramdom variable X represents the annual salaries in dollars of a group of teachers. Given the following probabilities: P(30,000) = .5; P(40,000) = .3; P(50,000) = .2, find the expected value E (X). X= 30,000, 40,000, 50,000

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