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The time to failure of an electric bulb follows a Weibull distribution with scale = 4000 hours and shape = 0.5. What is the mean

The time to failure of an electric bulb follows a Weibull distribution with scale = 4000 hours and shape = 0.5. What is the mean time to failure?

A. 8000

B. 4000

C. 2000

D. 1000

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