Home
Class 12
MATHS
There are 30 white balls and 10 red ball...

There are 30 white balls and 10 red balls in bag. 16 balls are drawn with replacement from the bag. If `X` be the number of white balls drawn then the value of `(mean(X))/(standard deviation(X))` is equal to (A) `4sqrt3` (B) `2sqrt3` (C) `3sqrt3` (D) `3sqrt2`

A

4

B

`(4sqrt(3))/(3)`

C

`4sqrt(3)`

D

`3sqrt(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

There are 4 white and 5 red balls ina bag.Three balls are drawn with replacement. Find the probability distribution for number of red balls.

There are 12 white and 12 red ball in a bag. Balls are drawn one by one with replacement from the bag. The probability that 7th drawn ball is 4th white, is

There are 5 white and 4 red balls in a bag. Three balls are drawn one by one without relacement. Find the probability distribution for the number of white balls drawn.

There are 5 white and 4 red balls in a bag. Two balls are drawn at random. Find the probability that both balls are white.

An urn contains 4 white and 3 red balls. Three balls are drawn with replacement from this urn. Then, the standard deviation of the number of red balls/drawn is

There are 5 red and 7 white balls in a bag. Two balls are drawn one by one without replacement. Find the probability that first ball is red and second is white.

In a bag there are 5 red balls, 3 white balls and 4 black balls. Four balls are drawn from the bag. Find the number of ways in which at most 3 red balls are selected?

A bag contains 3 red balls and 5 black balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is: red (b) black

A bag contains 3 White, 3Black and 2 Red balls. 3 balls are successively drawn without replacement. Find the probability that third ball is red.

A bag contains 4 white and 5 black balls. A ball is drawn at random from the bag. Find the probability that the ball drawn is white.

CENGAGE-JEE 2019-MCQ
  1. The outcome of each of 30 items was observed , 10 items gave an outcom...

    Text Solution

    |

  2. Contrapositive of the statement ''If two numbers are not equal, then t...

    Text Solution

    |

  3. There are 30 white balls and 10 red balls in bag. 16 balls are drawn w...

    Text Solution

    |

  4. If the sum of the deviations of 50 observations from 30 is 50, then th...

    Text Solution

    |

  5. Mean and variance of five observations are 4 and 5.2 respectively. If ...

    Text Solution

    |

  6. The system of linear equations x + y + z = 2 2x + 3y + 2z = 5 2...

    Text Solution

    |

  7. If the system of linear equations x-4y+7z=g, 3y-5z=h, -2x+5y-9z=k is c...

    Text Solution

    |

  8. If the system fo equations x+y+z = 5 x + 2y + 3z = 9 x + 3y + a...

    Text Solution

    |

  9. Let a(1),a(2),a(3), …, a(10) be in G.P. with a(i) gt 0 for i=1, 2, …, ...

    Text Solution

    |

  10. If the system of linear equations 2x+2y+3z=a 3x-y+5z=b x-3y+2z=...

    Text Solution

    |

  11. prove that [ [a-b-c , 2a , 2a ] , [2b , b-c-a , 2b ] ,[2c ,2c,c-a-b]]=...

    Text Solution

    |

  12. An ordered pair (alpha, beta) for which the system of linear equations...

    Text Solution

    |

  13. The set of all values of lambda for which the system of linear equatio...

    Text Solution

    |

  14. If A = [(costheta,-sintheta),(sintheta,costheta)], then the matrix A^(...

    Text Solution

    |

  15. Matrix=[[e^t,e^-t(sint-2cost),e^-t(-2sint-cost)],[e^t,-e^-t(2sint+cost...

    Text Solution

    |

  16. Let d in R and A= ((-2,4+d, sintheta-2),(1, sintheta+2,d),(5, 2sinthet...

    Text Solution

    |

  17. Let A=[(2,b,1),(b,b^(2)+1,b),(1,b,2)] where b gt 0. Then the minimum v...

    Text Solution

    |

  18. Let A=[[0,2q,r] , [p,q,-r] , [p,-q,r]] If A A^T=I3 then |p|=

    Text Solution

    |

  19. Let A and B be two invertible matrices of order 3xx3. If det. (ABA^(T)...

    Text Solution

    |

  20. Let P=[[1,0,0],[4,1,0],[16,4,1]]and I be the identity matrix of order ...

    Text Solution

    |