Answer:
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Step-by-step explanation:
Answer:
a)
b)
Step-by-step explanation:
Given:
The lifetimes of the individual items are independent exponential random variables.
Mean = 200 hours.
Assume, Ti be the time between ( )st and the failures. Then, the are independent with being exponential with rate
Therefore,
a)
The variance is given by,
507/17576 or 0.0288
you take all the probabilities separate then multiply them all together. Then Simplify
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