standard normal distribution

in physics examination, the mean grade is 80 and the standard deviation is 5, find the corresponding Z-score of the two students whose grade are 90 and 60 respectively
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1 Answer

Z-score for 90 is (90-80)/5=2. Within top 2.28%.

Z-score for 60 is (60-80)/5=-4. Corresponds to almost 0% (bottom).

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