I've already missed two points on this one..but I can't really figure out what I did wrong. Help would be appreciated.

---

The scores on a standardized test are normally distributed with a mean of 50 and a standard deviation of 10. What is the percentage of scores that are greater than 75? Use the Standard Normal Table.

my work:

z = (x-mean)/standard dev.

z = (75-50)/10

z = 2.5

then, using the standard normal table... 2.5 give you .9938.

to percentage... 99.38%

---

Where did I go wrong? thanks.