HINDSIGHT

Real or Random?

Ten pairs of charts. One is a real stock, one is a random walk. Can you beat a coin flip?

Ten rounds, two charts each. One is a real S&P 500 stock over 60 to 250 trading days; the other is a random walk generated with that stock's average return and volatility. Pick the real one, and see how your score compares with flipping a coin.

About 2 minutes. A new puzzle every day, the same for everyone.

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