In a normal distribution,what percentage of scores fall between -1 and +1 standard deviation units of the mean?

Question

Quizplus · Accepted Answer

According to the empirical rule of normal distribution, about 68 percent of scores fall within one standard deviation (either above or below) of the mean. Therefore, choice B is correct. Choice A is incorrect because it represents the percentage of scores that fall within one standard deviation of the mean in both directions (i.e. between -1 and +1), which is not what the question is asking for. Choice C and D are incorrect because they represent the percentages of scores that fall within two and three standard deviations of the mean, respectively.

In a Normal Distribution,what Percentage of Scores Fall Between -1