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I for a Normal Probability Distribution, About 95 Percent of the Area

question 85

Multiple Choice

i. For a normal probability distribution, about 95 percent of the area under normal curve is within
Plus and minus two standard deviations of the mean and practically all (99.73 percent) of the area
Under the normal curve is within three standard deviations of the mean.
ii. The total area under the normal curve is 100%.
iii. The mean of a normal probability distribution is 500 and the standard deviation is 10.
About 95 percent of the observations lie between 480 and 520.


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