Let X be a random variable with expectation E(X)=10 and variance var(X)=5. Which lower bound does Chebychev’s inequality gives on the probability that |X−E(X)|<4 (in decimal up to 4 places)?

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Let X be a random variable with expectation E(X)=10 and variance var(X)=5. Which lower bound does Chebychev’s inequality gives on the probability that |X−E(X)|<4 (in decimal up to 4 places)?

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