The mean undergraduate costs for tuition , room and board at four-year colleges is 26,489, and the standard deviation is $3204. The undergraduate costs for tuition, room, and board approximately...

The mean undergraduate costs for

tuition
, room and board at four-year colleges is 26,489, and the standard deviation is $3204. The undergraduate costs for tuition, room, and board approximately normally distributed. 36 four-year colleges are selected

1. The probability that the sample mean cost for these 36 schools is less than $25000 is?