For students who graduated from high school in 2013, their ACT math scores are approximately normally distributed

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For students who graduated from high school in 2013, their ACT math scores are approximately normally distributed with mean 20.9 points and standard deviation 5.3 points.
a. Is 25 points an unusual score on the math sections of the ACT? Explain.
b. Is 35 points an unusual score on the math sections of the ACT? Explain.
c. Find the cutoff for unusual scores greater than the mean on the math sections of the ACT. Round to the ones place.
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