Question: 4. Suppose that a random variable T is distributed as Weibull with parameters = 250, = 0.25, and threshold parameter = 0.

4. Suppose that a random variable T is distributed as Weibull with parameters α =

250, β = 0.25, and threshold parameter τ = 0.

(a) Find the mean and the variance of the random variable T.

(b) Find the probability P(5000 < T < 7000).

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