Regardless of the shape of a distribution, according to Chebyshev's Inequality, what is the minimum percentage of observations that will lie within+or-two standard deviations of the mean?（ ）
According to Chebyshev's Inequality, for any distribution, the minimum percentage of observations that lie within kstandard deviations of the distribution mean is equal to: 1-(1/k2 ), with k equal to the number of standard deviations. If k= 2, then the percentage of distributions is equal to 1- (1/4)=75%.