Instructions
Full Game: These are multiple-choice quizzes with four possible answer choices that include all questions in a given set.

What Greek letter, derived from Phoenician shin and used as the symbol for the summation operator in mathematics, is the 18th letter of the Hebrew alphabet?

Pi (Ππ)

Xi (Ξξ)

Lambda (Λλ)

Sigma (Σσ)

CORRECT

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Lowercase σ is used for volatility of a stock (generally needed for options pricing) and for the standard deviation of a population or probability distribution in statistics; the quality model Six Sigma (6σ) based on the standard deviation.