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Suppose test scores have a mean of 70 and a standard deviation of 20. In a random sample of 50 students, what is the probability

Suppose test scores have a mean of 70 and a standard deviation of 20. In a random sample of 50 students, what is the probability that the mean test score is less than 40? O.. a. P(Z < 40) O b. None of the options listed are correct P(x < 40) O d. O e. P(x < 40) P(Z < -1.5)

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