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  2. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    Example of samples from two populations with the same mean but different standard deviations. Red population has mean 100 and SD 10; blue population has mean 100 and SD 50. A large standard deviation indicates that the data points can spread far from the mean and a small standard deviation indicates that they are clustered closely around the mean.

  3. Daily mortgage rates for August 27, 2024: Average purchase ...

    www.aol.com/finance/daily-mortgage-rates-for...

    Paying at least 20% of your home's purchase price up front generally results in a lower interest rate — and you can avoid mortgage insurance, which increases your total cost. Your loan term.

  4. High-yield savings rates for September 5, 2024 - AOL

    www.aol.com/finance/savings-interest-rates-today...

    Today’s highest savings rates are at FDIC-insured digital banks and online accounts offering rates of up to 5.50% APY with low or no minimums at Poppy Bank, Western Alliance Bank, Jenius Bank ...

  5. Buy one, get one free - Wikipedia

    en.wikipedia.org/wiki/Buy_one,_get_one_free

    The economist Alex Tabarrok has argued, that the success of this promotion lies in the fact that consumers value the first unit significantly more than the second one. So compared to a seemingly equivalent "Half price off" promotion, they may only buy one item at half price, because the value they attach to the second unit is lower than even the discounted price.

  6. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_Code

    The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [5] [6] [7] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [8] the pattern of position detection was found and determined by applying the least-used ratio (1:1:3 ...

  7. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    Graph of number of coupons, n vs the expected number of trials (i.e., time) needed to collect them all, E (T ) In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests.

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