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Probability & Statistics : Chebychev Inequality

Suppose that a probability distribution has a mean 20 and standard deviation 3. The Chebychev inequality states that the probability that an outcome lies between 16 and 24 is:

a. less than 7/16
b. at least 7/16
c. at most 1/4
d. at least 1/4
e. none of the above

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The Chebychev inequality is investigated. The response received a rating of "5" from the student who originally posted the question.