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The probability that bulbs selected rand...

The probability that bulbs selected randomly from the lot has life less than 900 h, is

A

`11/40`

B

`5/16`

C

`7/16`

D

`9/16`

Text Solution

Verified by Experts

The correct Answer is:
D
Total number of bulbs in a lot, n(S)=80
Number of bulbs whose life time is less than 900h, n(E ) =10 + 12 + 23=45
`therefore` Probability that bulbs has life time less than 900 h`=(n(E ))/(n(S))=45/80=9/16`
Hence, the probability that bulb has life time less than 900 is `9/16`.
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