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प्रश्न
The probability that bomb will miss the target is 0.2. Then, the probability that out of 10 bombs dropped exactly 2 will hit the target is ____________.
पर्याय
`288/5^9`
`144/5^10`
`288/5^10`
`144/5^9`
MCQ
रिकाम्या जागा भरा
उत्तर
The probability that bomb will miss the target is 0.2. Then, the probability that out of 10 bombs dropped exactly 2 will hit the target is `underline(144/5^9)`.
Explanation:
Here, n = 10, p = 0.8, q = 0.2, r = 2
∴ Required probability = `""^10"C"_2 (0.8)^2 (0.2)^8`
= `""^10"C"_2 (4/5)^2 (1/5)^8`
= `(45 xx 16)/5^10`
= `(9 xx 16)/5^9`
= `144/5^9`
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