SAT math scores approx. follow a normal distribution, with mean 500 and standard deviation 100. What % of students should have an SAT math score above 500?

Question

I think I use mean (500) + z-score * SD (100), but I do not know how to get the z-score?

Answer 1

You don't need a z-score for this problem. A normal distribution means that half the observations are above the mean, half below. The answer is 50%