The question is:
**An estimated 1.8 million students take on student loans to pay ever-rising tuition and room and board (New York Times, April 17, 2009). It is also known that the average cumulative debt of recent college graduates is about $22,500.
The cumulative debt for college graduates is normally distributed with a standard deviation of $7,000.
Approximately how many recent college graduates have accumulated a student loan of more than $30,000?**
What I've done: 30,000-22500/7000=1.071428571 I then looked this up on the z table but that wouldn't give me the correct answer. What exactly am I doing wrong?