Scores on a statistics final in a large class were normally distributed with a mean of 75 and a standar deviation of 7.5. Find the following probabilities, round to the fourth. a) What is the probability 13 randomly chosen scores had an average greater than 75 Would it be unusual or usual for this to happen? Select an answer ✓ b) What is the probability 8 randomly chosen scores had an average less than 65 Would it be unusual or usual for this to happen? Select an answer ✓

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