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I read in a news story weeks ago that people get 90% of their coupons from the newspaper, which is crazy because there are SO MANY COUPONS ONLINE. If it sounds like I'm shouting it's because I am.
The standard deviation σ of X is defined as which can be shown to equal. Using words, the standard deviation is the square root of the variance of X . The standard deviation of a probability distribution is the same as that of a random variable having that distribution. Not all random variables have a standard deviation.
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