Home
Class 12
MATHS
The arithmetic mean of the observations ...

The arithmetic mean of the observations 10, 8, 5, a, b is 6 and their variance is 6.8. Then ab=

A

6

B

4

C

3

D

12

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • MATRICES

    SIA PUBLICATION|Exercise PROBLEMS|52 Videos
  • MOCK TEST 1

    SIA PUBLICATION|Exercise PHYSICS|12 Videos

Similar Questions

Explore conceptually related problems

The mean of five observations is 4 and their variance is 5.2. If three of these observations are 1,2 and 6. Then the other two are

The mean of 5 observations is 4.4 and their variance is 8.24. If three of the observations are 1, 2 and 6, then the other two observations are

IF the arithmetic mean of the roots of a quadratic equation is 8/5 and the arithmetic mean of their reciprocals is 8/7 then the equation is

The mean of 5 observations is 4.4 Their variance is 8.24 . If three of the observations are 1,2 and 6 . Find the other two observations

SIA PUBLICATION-MEASURES OF DISPERSION AND PROBABILITY -PROBLEMS
  1. Two teams A and B have the same mean and their coefficients of varianc...

    Text Solution

    |

  2. In a date the number i is repeated i times for i =1,2…., n . Then ...

    Text Solution

    |

  3. The arithmetic mean of the observations 10, 8, 5, a, b is 6 and their ...

    Text Solution

    |

  4. If the median of the data 6, 7, x-2, x, 18, 21 written in ascending or...

    Text Solution

    |

  5. Two persons A and B are rolling die on the condition that the person w...

    Text Solution

    |

  6. The letters of the word 'QUESTION' are arranged in a row at random. Th...

    Text Solution

    |

  7. If (1+3P)/(3),(1-2P)/(2) are probabilities of two mutually exclusive e...

    Text Solution

    |

  8. The probability that an event does not happen in one trial is 0.8 The ...

    Text Solution

    |

  9. If the mean and veriance of a binomial veriate X are 8 and 4 respectiv...

    Text Solution

    |

  10. A candidate take three tests in succession and the probability of pass...

    Text Solution

    |

  11. A six-faced unbiased die is thrown twice and the sum of the numbers ap...

    Text Solution

    |

  12. If A,B,C are mutually exclusive and exhaustive events of a random expe...

    Text Solution

    |

  13. If x(1), x(2),…..x(n) are n observations such that Sigmax(i)^(2)=400 a...

    Text Solution

    |

  14. The mean of four observations is 3. If the sum of the squares of these...

    Text Solution

    |

  15. Two numbers are chosen at random from (1,2,3,4,5,6,7,8) at a time. The...

    Text Solution

    |

  16. Two fair dice are rolled. The probability of the sum of digits on thei...

    Text Solution

    |

  17. A bag contains 2n + 1 coins . It is known that n of these coins have a...

    Text Solution

    |

  18. The random variable takes the values 1,2,3,…….m. If P(X=n)=(1)/(m) to ...

    Text Solution

    |

  19. If X is a Poisson variate and P(X=1)=2P(X=2) them P(X=3)=

    Text Solution

    |

  20. If X is a random Poisson variate such that alpha =P(X=1)=P(X=2) then P...

    Text Solution

    |