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WikiCards · Card list · Science cards · Expected value
Rare card · Science
Expected value, a Rare card
In probability theory, the expected value is a generalization of the weighted average.
- Rarity
- Rare
- Domain
- Science
- ATK
- 77
- DEF
- 70
- Power
- 147
- Wikipedia reads a year
- 290,000
Power 147 (ATK + DEF): stronger than 80 % of WikiCards cards.
Expected value quiz: 3 questions
Three questions on the Expected value card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
More generally, it is the Lebesgue integral of the random variable with respect to the ______ probability measure.
Answer
underlying. More generally, it is the Lebesgue integral of the random variable with respect to the underlying probability measure. From the Expected value article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
HTTP cookie. HTTP cookie 84 · Tensor 81 · Expected value 77 · U.S. Route 195 73 ATK in WikiCards.
Which of these Wikipedia articles is read the most in a year?
Answer
HTTP cookie. HTTP cookie 3,300,000 · Binomial distribution 470,000 · Expected value 290,000 · U.S. Route 195 3,800 Wikipedia reads over a year.
In a duel, each round asks a question like these about the opposing card, with 15 seconds to answer.
The facts on the card
The card carries these facts from its Wikipedia article.
- Provided that it is finite, the expected value can be interpreted as the long-run average of results from independent repetitions of the same random experiment, as formalized by the law of large numbers.
- For a random variable that takes finitely many values, the expected value is the weighted average of those values, with their probabilities as weights.
- More generally, it is the Lebesgue integral of the random variable with respect to the underlying probability measure.
Why it is Rare
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Expected value article was read about 290,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 77 and blocks with 70: each hit it takes is cut by 28 %.
How to get Expected value
Open packs. Each pack holds five cards drawn from real Wikipedia articles, the rarest last, and the fifth card is always Rare or better. The odds are shown in the game. A free pack arrives every hour and two can wait, and the Coins you win in duels buy more packs.
More Science cards
Cards close in power
The cards just above and just below Expected value in the power ranking, all domains together.
- Hideaki AnnoRare · Arts · ATK 75 DEF 72
- KabukiRare · Arts · ATK 80 DEF 67
- TensorRare · Science · ATK 81 DEF 66
- Bossa novaRare · Arts · ATK 70 DEF 77
- Absolute zeroRare · Science · ATK 74 DEF 73
- GrapeRare · Society · ATK 72 DEF 75
Card lists
- Wikipedia quizNew questions every day
- All cards from A to ZEvery card, by name
- Science cards
- Legendary cards
- Tier listS and A tiers by power (ATK + DEF)
Credits
Text : Wikipedia, Expected value (revision), CC BY-SA 4.0. Photo : Ainali, CC BY-SA 3.0, Wikimedia Commons.
