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The score on an exam from a certain statistics class, X, is normally distributed with =73.4 and =8.6. NOTE: Assume for the sake of this

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The score on an exam from a certain statistics class, X, is normally distributed with =73.4 and =8.6. NOTE: Assume for the sake of this problem that the score is a continuous variable. (a) Write the event "a score over 63.4 " in terms of X : (b) Find the probability of this event: (c) Find the probability that a randomly chosen score is greater than 80.9 : (d) Find the probability that a randomly chosen score is between 63.4 and 80.9

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