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Bayes' Theorem

The probabili...

Question

The probability that a bulb selected at random has a maximum battery life of 700 hours is

A

\frac{11}{40}

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B

\frac{29}{40}

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C

\frac{29}{80}

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D

\frac{29}{90}

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Solution

The correct option is C $\frac{29}{40}$
No. of bulbs having maximum battery life of $700$ hours = $10 + 25 + 23$ = $58$
Probability $P = \frac{58}{80} = \frac{29}{40}$
hence, option $B$ is correct.

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In Q.No. 5, the probability that a bulb selected at random from the the lot has life less than 900 hours is _________.

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