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Engineers' hourly income at a specific company follow a normal distribution with mean of $71 and the variance of $64. What is the probability that

Engineers' hourly income at a specific company follow a normal distribution with mean of $71 and the variance of $64. What is the probability that the mean hourly income of a random sample of 4 Engineers to be less than $73? a. 0.5 b. 0.6915 c. 0.0 d. 0.3085 e. impossible to determine with the information given

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