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Consider an exam in a random class with average of 74%. What is the maximum probability that a randomly chosen student score is 80% or

Consider an exam in a random class with average of 74%. What is the maximum probability that a randomly chosen student score is 80% or higher?

In the previous problem, suppose we also know that the standard deviation = 10. Find a lower bound that the probability of a randomly chosen student score is between 58% and 90%

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