According to the Chebyshev rule,at least what percentage of the observations in any data set are contained within 2 standard deviations around the mean?
A)67%
B)75%
C)88.89%
D)95%

Question

Quizplus · Accepted Answer

Chebyshev's theorem states that for any data set, regardless of the distribution, at least 1 - (1/k^2) of the data within a dataset will fall within k standard deviations from the mean. For k=2, this gives 1 - (1/2^2) = 1 - 1/4 = 3/4 or 75%.

According to the Chebyshev Rule,at Least What Percentage of the Observations