An ecologist wishes to mark off a circular sampling region having radius 10 m. However, the radius of the resulting region is actually a random variable R with the following pdf. 1- (10-)²] 9 ≤r≤ 11 0 otherwise 3 [₁ f(r) = 4 What is the expected area of the resulting circular region? (Round your answer to two decimal places.) m²

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