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The mean mark on a mathematics exam was 70%, with a standard deviation of 10%. a) If 200 students wrote the exam, how many would

The mean mark on a mathematics exam was

70%, with a standard deviation of 10%.

a) If 200 students wrote the exam, how

many would be expected to score

between 60% and 80%?

b) How many students would be expected

to score above 90%?

c) How many students would be expected

to score below 50%?

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