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The time of a telephone call (in minutes) to a certain town is a continuous...

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Calculus

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The time of a telephone call (in minutes) to a certain town is a continuous random variable with a probability density function defined by f(x) = 3x^-4 for [1,? ). Find theprobability: P(x?2).A. 0.2500B. 0.8914C. 0.1250D. 0.8409

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Please help. Thank you!