. How many students would be expected to have a mark between C and A (60 & 90)?

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4. The mean and standard deviation for the exam results from a class of 135
students were calculated, mean = 74  SD = 11 with a normal distribution. How many
students would be expected to have a mark between C and A (60 & 90)? Hint: you need to calculate the z-score for both grades to get the total area. Once again can't have part of a student.

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