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80 bulbs are selected at random from a l...

80 bulbs are selected at random from a lot and their lifetime in hours is recorded as under

One bulb is selected at random from the lot . What is the probability that the selected bulb has a life more than 500 hours ?

A

`(27)/(40)`

B

`(29)/(40)`

C

`(5)/(16)`

D

`(11)/(40)`

Text Solution

Verified by Experts

The correct Answer is:
B
Total number of bulbs = 80 .
Number of bulbs having their lifetime more than 500 hours = (23 + 25 + 10) = 58 .
Required probability = `(58)/(80) = (29)/(40)`.
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