Assume that the salaries of elementary school teachers in th

Assume that the salaries of elementary school teachers in the United States are normally distributed with a mean of $28,000 and a standard deviation of $3000. What is the cutoff salary for teachers in the bottom 10%

Solution

Subtract from 0.5-0.10=0.4

Now, the closest value found from z score table is 0.4013.

Now, X=z+

=0.4013*3000+28000

=29203.9