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  2. Shop Mark & Graham's Big Gift Event and save up to 50% off ...

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    See 7 more. Right now, during the Mark & Graham Big Gift Event, you can score up to 50% off select bestselling styles and you can get free shipping and an additional 20% off clearance items...

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  5. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    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.

  6. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    Coupon collector's problem. In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: If each box of a brand of cereals contains a coupon, and there are n different types of coupons, what is the probability that more than t boxes need to be ...

  7. Coupon (finance) - Wikipedia

    en.wikipedia.org/wiki/Coupon_(finance)

    Coupons are normally described in terms of the "coupon rate", which is calculated by adding the sum of coupons paid per year and dividing it by the bond's face value. For example, if a bond has a face value of $1,000 and a coupon rate of 5%, then it pays total coupons of $50 per year.