What percent of the observations from a Normal distribution lie between a standard score of -1 and a standard score of 2? (Hint: sketch a Normal curve.)
A) 16%
B) 47.5%
C) 50%
D) 61%
E) 81.5%

Question

Quizplus · Accepted Answer

Approximately 34% of observations lie between a mean (0) and one standard deviation above (1), and about 47.5% lie between the mean and two standard deviations above (2). Adding the percentage of observations between -1 and 0 (34%) to the observations between 0 and 2 (34% + 47.5%) gives us 81.5%.

What Percent of the Observations from a Normal Distribution Lie