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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 ...
The original name of the WorldPerks program was the Northwest Orient Airlines Free Flight Plan, which began in 1981. [77] The original program used paper coupons and gave credit for flight segments. Upon renaming the program to "WorldPerks" in 1986, a mileage-based system was used.
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 ...
A country's gross domestic product (GDP) at purchasing power parity (PPP) per capita is the PPP value of all final goods and services produced within an economy in a given year, divided by the average (or mid-year) population for the same year. This is similar to nominal GDP per capita but adjusted for the cost of living in each country.
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The Digest of Education Statistics contains a set of tables covering the broad field of American education from prekindergarten through graduate school. Latest version of all Digest tables. Archived tables and figures: Select a release year. Access PDF versions of the Digest from 1990 to 2020. NEW Digest State Dashboard.
NCES Video Highlights. The Condition of Education is an annual report to Congress summarizing important developments and trends in the U.S. education system. The report presents 50 indicators on topics ranging from prekindergarten through postsecondary education, as well as labor force outcomes and international comparisons.