Question: The amount of time devoted to studying statistics each week by students who achieve a grade of A in the course is a normally distributed

The amount of time devoted to studying statistics each week by students who achieve a grade of A in the course is a normally distributed random variable with a mean of 7.5 hours and a standard deviation of 1.8 hours.

Find the probability that an A student spends between 6 and 9 hours studying.

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