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53 students have taken the midterm examination in mathematics. The average score is 144, the median is 150, and the maximum score is 260. The

53 students have taken the midterm examination in mathematics. The average score is 144, the median is 150, and the maximum score is 260. The standard deviation is 54. Suppose that the grade distribution is A+, A0, A-, B+, B0, B-, C+, C0, C-, D+, D0 and D-.

a) What score range for each grade?

b) What grade would students get if the scores are below the standard deviation?

c) How many students got scores below the standard deviation?

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