If the mean score on a stress scale is 5,the standard deviation is 2,and the distribution is normal,the percentage of people who would obtain scores between 5 and 9 is
A)34%
B)14% + 34% = 48%
C)50%
D)34% + 34% = 68%

Question

Quizplus · Accepted Answer

In a normal distribution, the area between the mean and one standard deviation above the mean (5 to 7) accounts for 34% of the data. Extending to two standard deviations above the mean (7 to 9) covers an additional 14%. Therefore, the total percentage of people scoring between 5 and 9 is 34% + 14% = 48%.

If the Mean Score on a Stress Scale Is 5,the