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It is given that 10% of the electric bul...

It is given that 10% of the electric bulbs manufactured by a company are defective. In a sample of 20 bulbs, find the probability that more than 2 are defective.

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The correct Answer is:
`underset(r=3)overset(20)sum""^(20)C_(k)(.9^(20-r))1/(10^(20))`
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AAKASH SERIES-RANDOM VARIABLE -EXERCISE-3.2 (VERY SHORT ANSWER QUESTIONS)
  1. If X~B(10,0.6) then, find mean and variance of X.

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  2. In a binomial distribution n=400, p=1//5, It's standard deviation is

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  3. X~B(n,p) and mean and variance of X are (15)/(2) and (15)/(4). Find n ...

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  4. For a binomial distribution with mean 6 and variance 2, find the first...

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  5. In a binomial distribution, the parameter n=6. If 9P(X=4)=P(X=2), then...

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  6. The mean and variance of a Binomial variate are 2.4 and 1.44 respectiv...

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  7. The mean and variance of a binomial distribution are 4 and 3 respectiv...

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  8. If the difference between the mean and variance of a Binomial variate ...

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  9. A fair coin is tossed a fixed number times . If the probability of get...

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  10. 8 coins are tossed simultaneously. Find the probablity of getting at l...

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  11. In the experiment of tossing a coin n times, if the variable X denotes...

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  12. In an average , rain falls on 12 days in every 30 days. The probabilit...

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  13. The probability that a person chosen at random is left handed (in hand...

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  14. It is given that 10% of the electric bulbs manufactured by a company a...

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  15. One in 9 ships is likely to be wrecked when they are set on a sail. Wh...

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  16. The probability of a bomb hitting a bridge is 1//2 and two direct hits...

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