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There are two states, Sunny (with probability 80%) and Rainy (with probability 20%). The return of Parasol is 20% when sunny and -5% when rainy.

There are two states, "Sunny" (with probability 80%) and "Rainy" (with probability 20%).

The return of Parasol is 20% when sunny and -5% when rainy.

The return of Umbrella is 0% when sunny and10% when rainy. What is the correlation between Parasol and Umbrella?

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