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2. Coupon collector's problem - Wikipedia

   en.wikipedia.org/wiki/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 given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more than t boxes need to be bought ...

3. Discounts and allowances - Wikipedia

   en.wikipedia.org/wiki/Discounts_and_allowances

   For the band, see Senior Discount (band). Discounts and allowances are reductions to a basic price of goods or services. They can occur anywhere in the distribution channel, modifying either the manufacturer's list price (determined by the manufacturer and often printed on the package), the retail price (set by the retailer and often attached ...

4. Buy one, get one free - Wikipedia

   en.wikipedia.org/wiki/Buy_one,_get_one_free

   Buy one, get one free. " Buy one, get one free " or " two for the price of one " is a common form of sales promotion. 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 ...

5. Birthday problem - Wikipedia

   en.wikipedia.org/wiki/Birthday_problem

   The equation expresses the fact that the first person has no one to share a birthday, the second person cannot have the same birthday as the first (⁠ 364 / 365 ⁠), the third cannot have the same birthday as either of the first two (⁠ 363 / 365 ⁠), and in general the n th birthday cannot be the same as any of the n − 1 preceding birthdays.

6. Best CD rates today: Protect your savings with today's ... - AOL

   www.aol.com/finance/best-cd-rates-today-protect...

   It's expected that the Federal Reserve will hold the Fed rate at 5.25% to 5.50% at its next policy meeting on July 30 and July 31, 2024. The CME FedWatch Tool, which measures market expectations ...

7. Standard deviation - Wikipedia

   en.wikipedia.org/wiki/Standard_deviation

   Stock A over the past 20 years had an average return of 10 percent, with a standard deviation of 20 percentage points (pp) and Stock B, over the same period, had average returns of 12 percent but a higher standard deviation of 30 pp. On the basis of risk and return, an investor may decide that Stock A is the safer choice, because Stock B's ...