Find the mean lifetime of electrical device

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Find the mean lifetime of this device? A electrical device consists of 4 identical components arranged so that the device functions if and only if all four components are working. The lifetime of each component (in appropriate units) has probability density function.

f(t) = 6 / (1+t)^7 for 0 <= t < infinity

Find the mean lifetime of this device?

Reference no: EM13132571

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