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An electric bulb will last 190 days or more with a probability 0.7 and it will last for atmost 200 days with a probability of 0.8. The probability that the bulb will last between 190 and 200 days is

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0.5

0.2

0.56

0.3

answer is A.

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Detailed Solution

$1 = P (A) + P (B) - P (A \cap B)$

$\Rightarrow P (A \cap B) = 0.7 + 0.8 - 1$

= $0.5$

The probability that the bulb will last between 190 and 200 days is 0.5

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