Assuming a normal distribution,what range of numbers would include two thirds of the scores if they ranged from 50 to 99,M = 75,and SD = 5? Between
A) 55 and 95
B) 65 and 85
C) 68 and 82
D) 70 and 80

Question

Quizplus · Accepted Answer

In the normal curve,68% of scores will be within 1 standard deviation above or below the mean.In the example,two thirds of scores (66%)fall between 70 and 80.The mean = 75 and the SD = 5 for this sample.It follows that scores will fall between 1 standard deviation below (75 - 5 = 70)and 1 standard deviation above the mean (75 + 5 = 80).The other three statements are incorrect.

Assuming a Normal Distribution,what Range of Numbers Would Include Two