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The scores on a test given to all juniors in a school district are normally distributed with a mean of 75 and a standard deviation of 7.


Find the percent of juniors whose score is no more than 89.


The percent of juniors whose score is 89 or below is ___%

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LammettHash

\(\mathbb P(X\le89)=\mathbb P\left(\dfrac{X-75}7\le\dfrac{89-75}7\right)=\mathbb P(Z\le2)\approx0.9773=97.73\%\)

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