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In a box there are 20 non-defective and ...

In a box there are 20 non-defective and some defective bulbs. If the probability that a bulb selected at random from the box found to be defective is `3//8` then, find the number of defective bulbs.

Answer

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In a box containing 10 bulbs, 2 are defective. What is the probability that among 5 bulbs chosen at random , none is defective ?

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Knowledge Check

  • In a box containing 100 bulbs, I0 are defective. The probability that out of a sample of 5 bulbs, none is defective is

    A
    `10^(-1)`
    B
    `((1)/(2))^(5)`
    C
    `((9)/(10))^(5)`
    D
    `(9)/(10)`

  • Choose the correct answer: In a box containing 100 bulbs, 10 are defective. The probability that out of a sample of 5 bulbs, none is defective is

    A
    `10^(-1)`
    B
    `((1)/(2))^(5)`
    C
    `((9)/(10))^(5)`
    D
    `(9)/(10)`

  • Two items are chosen from a lot containing twelve items of which four are defective, then the probability that at least one of the item is defective

    A
    `19/33`
    B
    `17/33`
    C
    `23/33`
    D
    `13/33`

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    Two items are chosen from a lot containing twelve items of which four are defective. Then the probability that atleast one of the item is defective

    Two items are chosen from a lot containing twelve items of which four are defective, then the probability that at least one of the item is defective

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