80 bulbs are selected at random from a lot and their lifetime is recorded in the form of a frequency table given below: A bulb is chosen at random from the lot. The probability that the bulb chosen has lifetime less than 900 hours is:

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740

35

516

2380

answer is B.

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Detailed Solution

Given 80 bulbs are selected and their lifetime is recorded.
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Bulbs having lifetime less than 900 hours are,
= 10 + 15 + 23
= 48
Number of bulbs having lifetime less than 900 hours = 48
And, total number of outcome = 80
Now, the probability that the bulb chosen has lifetime less than 900 hours is,

= Number of bulbs having lifetime less than 900 hours Total number of outcomes = 4880

= 35

The probability is

35

.
Hence, option 2 is correct.

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