At Thomas Nelson Community College, the Pre-Test for Mathematics has 200 points on the test. The mean is 120 and the standard deviation is 20. What is the approximate percentage of students that scored below 100 points?

Answer 1

We can use the z-score formula to find the percentage of students that scored below 100 points:

z = (x - μ) / σ

where x is the score we're interested in (100), μ is the mean (120), and σ is the standard deviation (20).

z = (100 - 120) / 20 = -1

Using a z-score table or calculator, we can find that the percentage of students that scored below 100 points is approximately 15.87%.