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If the probability that a fulurorescent ...

If the probability that a fulurorescent light has a useful life of a least 800 hours is 0.9 find the probability that among 20 such lights at least 2 will not have a useful life of at least 800 hours. [ Given `(0.9) = 0.1348 ] `

A

`1-(2.9)(0.9)^20`

B

`1-(0.9)(2.9)^20`

C

`1-(2.9)(0.9)^19`

D

`1-(2.9)(0.9)^19`

Text Solution

Verified by Experts

The correct Answer is:
C
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