If the percentage of scores falling between the mean and a z score of 0.50 is 19.15, then what is the percentage of scores falling below a z score of -0.50?
A) -19.15
B) 19.15
C) 30.85
D) -30.85

Question

Quizplus · Accepted Answer

We know that the area between the mean and a z score of 0.50 is 19.15. This means that the area from the mean to -0.50 (which is the same distance from the mean as 0.50, just in the opposite direction) is also 19.15. Therefore, the percentage of scores falling below a z score of -0.50 would be 50% - 19.15% = 30.85%.

If the Percentage of Scores Falling Between the Mean and a Z