If a normally distributed group of test scores have a mean of 70 and a standard deviation of 12, find the percentage of scores that will fall below 50.
A) 4.75%
B) 45.25%
C) 6.75%
D) 35.54%

Question

Quizplus · Accepted Answer

To find the percentage of scores below 50, calculate the z-score: z = (50 - 70) / 12 = -1.67. Using the standard normal distribution table, a z-score of -1.67 corresponds to approximately 4.75%.

If a Normally Distributed Group of Test Scores Have a Mean