How to find standard deviation of random variable

There are four steps to finding the standard deviation of random variables. First, calculate the mean of the random variables. Second, for each value in the group (45, 40, 25, and 12)

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Mean or Expected Value and Standard Deviation

Correct answer: 108.2 Explanation: The z-score equation is given as: z = (X - μ) / σ, where X is the value of the element, μ is the mean of the population, and σ is the standard deviation. To solve

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Standard Deviation of Discrete Random Variables

Discrete random variable can take infinite (countable) amount of values, in that case sum will be from 1 to infinity, and the point is to find the sum of the infinite row Standard

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