THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION

question 162

Essay

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
Chebyshev's theorem is used to approximate the proportion of observations for any data set,regardless of the shape of the distribution.Assume that a distribution has a mean of 255 and standard deviation of 20.
-Approximately what proportion of the observations is between 225 and 285?

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