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Salaries for teachers in a particular elementary school district are normally distributed with a mean of...

Salaries for teachers in a particular elementary school district are normally distributed with a mean of $45,000 and a standard deviation of $6,100. We randomly survey ten teachers from that district. (Round your answers to the nearest dollar.)

(a) Find the 90th percentile for an individual teacher's salary. $

(b) Find the 90th percentile for the average teacher's salary. $

Math   Statistics-And-Probability   
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Answer #1

By excel function NORMSINV(area), z value for 90th percentile is

z90th percentile = 1.28155

(a) 90th percentile calculation

(b) 90th percentile calculation for average

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