Question

The sat exams are scaled so that scores should roughly follow the normal distribution with mean 500 and standard deviation 100.how high must a student score on the sat mathematics exam to fall in the top 25% of all scores?

Answer 1

568

Explanation:

Using a z-score table, we see the minimum z-score is about 0.68.

Using the formula for the z-score,

`(x-500)/(100)=0.68 \\ \\ x-500=68 \\ \\ x=568`