An estimated 1.6 million students take on student loans to pay ever-rising tuition and room and board (The New York Times, April 17, 2009). It is also known that the average cumulative debt of recent college graduates is about $21,400. Let the cumulative debt among recent college graduates be normally distributed with a standard deviation of $6,000. Approximately how many recent college graduates have accumulated student loans of more than $30,000? (You may find it useful to reference the z table. Round your final answer to the nearest whole number.)

Number of graduates= ?