For the most current year available, the mean annual cost to attend private university in United States was $20,207. Suppose the distribution of annual costs follows the normal probability distribution and the standard deviation is $4,375.
Ninety percent of all students at private universities pay less than what amount? (Round z value to 2 decimal places and your final answer to the nearest whole number. Omit the "tiny_mce_markerquot; sign in your response.)