Page 327, 5.1.9.* For X₁, ...,Xn be iid random variables with common pdf f(x) = exp{-(x-20)}, x > 20, , -∞ < 0 < ∞, f(x) = 0, elsewhere. This pdf is called the shifted exponential, shifted by 20. Let Y₁ = min{X₁, ...,Xn}, obtain the mean of Yn. Is Yn an unbiased estimator of 20? Obtain an unbiased estimator of 20 based on Y

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