If I chose a score of 235, this would be my work for the z-value:

(235-500)/75 = -265/75 = -3.53

A score of 235 would be 3.53 standard deviations below the mean and .02% of students would likely get a score below this value.

Look at the above solutions. Are the student's calculations correct? If yes, note this and if not correct them with an example. Next, determine what percentage of students will likely get a score above the value the student selected. What happens when you combine your percentage with the percentage they listed for below?