amy borrows $130 to buy supplies for her birthday party. she receives gifts and money from her friends and family. the total amo
2 answers:
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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,