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2. 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 given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more ...

3. Academic grading in South Africa - Wikipedia

   en.wikipedia.org/wiki/Academic_grading_in_South...

   Code 2 (E): 30% - 39% Code 1 (F): 0% - 29% The OBE system, when in its experimental stages, originally used a scale from 1 - 4 (a pass being a 3 and a '1st class pass' being above 70%), but this system was considered far too coarse and replaced by a scale from 1 to 7.

4. Academic grading in the United States - Wikipedia

   en.wikipedia.org/wiki/Academic_grading_in_the...

   (For example, a B in a regular class would be a 3.0, but in honors or AP class it would become a B+, or 3.33). Sometimes the 5-based weighing scale is used for AP courses and the 4.6-based scale for honors courses, but often a school will choose one system and apply it universally to all advanced courses.

5. Screen printing - Wikipedia

   en.wikipedia.org/wiki/Screen_printing

   Screen printing is a printing technique where a mesh is used to transfer ink (or dye) onto a substrate, except in areas made impermeable to the ink by a blocking stencil.A blade or squeegee is moved across the screen to fill the open mesh apertures with ink, and a reverse stroke then causes the screen to touch the substrate momentarily along a line of contact.

6. Grading systems by country - Wikipedia

   en.wikipedia.org/wiki/Grading_systems_by_country

   Colombia. The most used grading systems are the numerical from 0 to 5 or from 0 to 10 and commonly are approved with 3 or 6, respectively. The letter system consists of E, S, B, A, I and is approved with A. The letter system is based on the numerical, meaning that the numerical system guides the letter one.

7. Rorschach test - Wikipedia

   en.wikipedia.org/wiki/Rorschach_test

   Rorschach test. The Rorschach test is a projective psychological test in which subjects' perceptions of inkblots are recorded and then analyzed using psychological interpretation, complex algorithms, or both. Some psychologists use this test to examine a person's personality characteristics and emotional functioning.