Question 1
The ages of students at a university are normally distributed with a mean of 21. What percentage of the student body is at least 21 years old?
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It could be any value, depending on the magnitude of the standard deviation
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50%
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21%
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1.96%
Question 2
The center of a normal curve is
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always equal to zero
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is the mean of the distribution
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cannot be negative
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is the standard deviation