Although Dominick's psychology class is sometimes longer or shorter than usual,on average each class is 50 minutes.If the lengths of these classes form a normal curve,which statistic would enable Dominick to estimate the probability that any single class will last somewhere between 47 and 53 minutes?
A) mode
B) median
C) range
D) standard deviation

Question

Quizplus · Accepted Answer

The standard deviation would give Dominick an idea of how spread out the class lengths are from the mean of 50 minutes. With this information, he can estimate the probability of a class being between 47 and 53 minutes using the empirical rule, which states that for a normal distribution, approximately 68% of the data falls within one standard deviation of the mean, 95% falls within two standard deviations, and 99.7% falls within three standard deviations.

Although Dominick's Psychology Class Is Sometimes Longer or Shorter Than