At a certain college, the average score of a first year student on the verbal part of the SAT is 565, with a standard deviation of 75. If the distribution of the scores is normal, what proportion of that school's first year students have verbal SATs over 650? Under 500?

For some reason I cannot find the probability of a score under 500. I know the first answer is .129 but it seems that what I'm doing for the second part isn't working. I have P(Z< -87) and I'm getting .1922 but that is not correct.