Question #316394

The results of a Nationwide aptitude test in mathematics are normally distributed with m=80 and s=15 what percentile rank of a score of 90

Expert's answer

P(X<90)=P(Z<90−8015)=P(Z<0.67)=0.7486.P(X<90)=P(Z<\frac{90-80}{15})=P(Z<0.67)=0.7486.

Percentile rank: 74.


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