Question

For the most recent year available, the mean annual cost to attend a private university in the United States was $26,889. Assume the distribution of annual cost follows the normal probability distribution and the standard deviation is 4,500. Ninety-five percent of all students at private universities pay less than what amount?

Answer 1

Using the 68-95-99.7 rule, we get:

$26889+2(4500)\\26889+9000\\35889$

$35,889