According to Chebyshev's theorem, at least what proportion of observations lies within two standard deviations of the mean?
Correct answer: C. 75 percent
- A. 50 percent
- B. 60 percent
- C. 75 percent
- D. 95 percent
Explanation
Chebyshev's theorem gives the minimum proportion as 1 minus 1 divided by k squared. For k equal to 2, this is 1 minus 1/4, or 75 percent.
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