Help on part B

Teachers' Salaries The average annual salary for all U.S. teachers is $47,750. Assume that the distribution is normal and the standard deviation is $5680. Find these probabilities of the earnings of a teacher selected randomly. Round the final answers to at least four decimal places and intermediate z value calculations to two decimal places. Ed Part 1 of 2 (a) Between $28,400 and $43,700 a year P (28,400 42,000) =