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A new battery’s voltage may be acceptable (A) or unacceptable (U). A certain flashlight requires two...

A new battery’s voltage may be acceptable (A) or unacceptable (U). A certain flashlight requires two batteries, so batteries will be independently selected and tested until two acceptable ones have been found. Suppose that 90% of all batteries have acceptable voltages. Let Y denote the number of batteries that must be tested.

(a) Use PMF to find PY(2)

(a) Use PMF to find PY(3)

(c) Find general formula for PMF PY​​​​​​​(k) k = 1,2,3,4....

Math   Statistics-And-Probability   
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