Salaries for teachers in a particular elementary school district are normally distributed with a mean of $46,000and a standard deviation of $4,200. We randomly survey ten teachers from that district. (Round your answers to the nearest dollar.)

(a) Find the 90^thpercentile for an individual teacher's salary. $ 51382 ( this is what i got with invnorm cal and it said correct.) I can not seem to figure out question b. (b) Find the 90^thpercentile for the average teacher's salary. $ ?