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The probability that an event A happens ...

The probability that an event A happens in one trial of an experiment, is 0.4. Three independent trials of the experiments are performed. The probability that the event A happens atleast once, is :

A

`0.936`

B

`0.784`

C

`0.904`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
Required Probability
`=1-P` (The event does not happen in any trails)
`=1-(0.6)^3=0.784` .
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OBJECTIVE RD SHARMA ENGLISH-DISCRETE PROBABILITY DISTRIBUTIONS-Exercise
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  2. A random variable has the following probability distribution: X=xi :\...

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  3. If X is a random variable with probability distribution as given be...

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  4. If in a distribution each x is replaced by corresponding value of f(x)...

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  5. A man takes a step forward with probability 0.4 and backward with p...

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  6. The probability that a man can hit a target is 3//4. He tries 5 times....

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  7. Six ordinary dice are rolled. The probability that at least half of th...

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  8. Two persons each makes a single throw with a pair of dice. Find the pr...

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  9. If the range ot a random vaniabie X is 0,1,2,3, at P(X=K)=((K+1)/3^k) ...

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  10. An experiment succeeds twice as often as it fails. Find the probabi...

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  11. The probability that a candidate secure a seat in Engineering through ...

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  12. Six coins are tossed simultaneously. The probability of getting at lea...

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  13. about to only mathematics

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  14. Two players toss 4 coins each. The probability that they both obtain t...

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  15. A box contains 24 identical balls of which 12 are white and 12 are bla...

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  16. Two dice are tossed 6 times. Then the probability that 7 will show an ...

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  17. If X follows a binomial distribution with parameters n=6 and p. If 4P(...

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  18. The number of times a die must be tossed to obtain a 6 at least one wi...

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  19. Seven chits are numbered 1 to 7. Four chits are drawn one by one with ...

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  20. If the mean of a binomial distribution is 25, then its standard deviat...

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  21. The value of C for which P(X=k)=Ck^2 can serve as the probability func...

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