The mean height of a sample is with a standard deviation of . Assuming a normal distribution, roughly what range contains of the sample?
Answer and explanation
Correct answer: C. to
- Step 1: About of values in a normal distribution lie within two standard deviations of the mean.
- Step 2: , giving to cm.
Answer
to .
Why not the others: to : is the range within one standard deviation, about of values. to : is within three standard deviations, about of values. to : covers only one side of the mean.
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