Many firms use on-the-job training to teach their employees computer programming. Suppose you work in the personnel department of a firm that just finished training a group of its employees to program, and you have been requested to review the performance of one of the trainees on the final test that was given to all trainees. The mean and standard deviation of the test scores are 74 and 2, respectively. Assuming nothing is known about the distribution, what percentage of test-takers scored above 80?
A) at most 11%
B) at least 89%
C) approximately 0.15%
D) approximately 99.85%

Question

Quizplus · Accepted Answer

Using Chebyshev's inequality, at most 11% of test-takers scored above 80, as 80 is 3 standard deviations above the mean.

Many Firms Use On-The-Job Training to Teach Their Employees Computer