Chebyshev's Inequality in Probability

SOLVED: According to the Chebyshev rule; at least 75% of all observations in any data set are contained within a distance of how many standard deviations around the mean?Select one:A 1B. 2

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We saw that if we want to have a probability of at least 95% that the poll results are within 1 percentage point of the truth, Chebyshev's inequality recommends a sample size of n=50,000 . This is very large compared to what is done in practice. Newspaper polls use smaller sample sizes for various reasons. For each of the following, decide whether it is a valid reason. In the real world, a) the accuracy requirements are looser.b) the Chebyshev bound is too conservative. c) the people sampled are