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If X denotes the number obtained on the...

If X denotes the number obtained on the uppermost face when a fair die is thrown, then E (X) =

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A die is thrown 560 times. The number 6 appears on the upper face 72 times. A die is thrown at random. What is the probability of getting 6.

Let X denote the sum of the numbers obtained when two fair dice are rolled.Find the variance and standard deviation of X .

Knowledge Check

  • If X denotes the number obtained on the uppermost face when a fair die is thrown, then Var (X) =

    A
    `(49)/(4)`
    B
    `(70)/(12)`
    C
    `(7)/(2)`
    D
    `(35)/(12)`

  • If X denotes the sum of the numbers obtained when two fair dice are rolled, then the variance and standard deviation of X are

    A
    `31/6 ` and `sqrt(31/6)`
    B
    `35/6`and` sqrt(35/6)`
    C
    `17/6` and `sqrt(17/6)`
    D
    `31/6` and `sqrt(35/6)`

  • Two fair dice are thrown. If X denotes the sum of the numbers appearing on the uppermost face, then P(2ltXlt10)

    A
    `(29)/(36)`
    B
    `(31)/(36)`
    C
    `(1)/(6)`
    D
    `1/8`

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    Two dice are thrown simultaneosly. E is the event that sum of numbers on the uppermost face is at least 10 , then n(E ) …………

    Assertion : A die is thrown. Let E be the event that number appears on the upper face is less than 1, then P( E) = 1/6 Reason : Probability of impossible event is 0.

    A die is thrown 260 times. Prime numbers appear on the upper face 39 times. If a dia is thrown at random, what is the probability of getting a prime number?

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