Job Applicant Test Scores

Essay

Job Applicant Test Scores
A new manufacturing plant has 20 job openings. To select the best 20 applicants from among the 1000 job seekers, the plant's personnel office administers a written aptitude test to all applicants. The average score on the aptitude test is 150 points, with a standard deviation of 10 points. Assume the distribution of test scores is approximately mound-shaped.
-Refer to the Job Applicant Test Scores statement. What percentage of the test scores will fall between 130 and 160 points?