Home
Class 14
MATHS
The variance of 20 observations is 5. If...

The variance of 20 observations is 5. If each observation is multiplied by 3, then what is the new variance of the resulting observations?
(a)5
(b)10
(c)15
(d)45

A

5

B

10

C

20

D

40

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • STATISTICS

    PUNEET DOGRA|Exercise PRE YEAR QUESTIONS |163 Videos

  • SET & RELATION

    PUNEET DOGRA|Exercise PREV YEAR QUESTIONS|65 Videos

  • TRIGONOMETRY

    PUNEET DOGRA|Exercise PREV YEAR QUESTIONS|163 Videos

Similar Questions

Explore conceptually related problems

The variance of 20 observation is 5. If each observation is multiplied by 3, then what is the new variance of the resulting observation?

The variance of 20 observation is 5. If each observation is multiplied by 2, then what is the new variance of the resulting observation?

The variance of 20 observation is 5. If each observation is multiplied by 2, then what is the new variance of the resulting observation?

The variance of 20 observations is 5. If each observation is multiplied by 2, find the new variance of the resulting observations.

The variance of 20 observations is 5. If each observation is multiplied by 2find the variance of the resulting observations.

The variance of 20 observations is 5 .If each observation is multiplied by -1 and added by 2 ,then new variance is

PUNEET DOGRA-STATISTICS-PRE YEAR QUESTIONS
  1. Consider the following statements in respect of histogram. I. The al...

    Text Solution

    |

  2. Consider the following statements in respect of a histogram: 1. The ...

    Text Solution

    |

  3. The variance of 20 observations is 5. If each observation is multiplie...

    Text Solution

    |

  4. The marks obtained by 13 students in a test are 10, 3, 10, 12. 9. 7. 9...

    Text Solution

    |

  5. Consider the following statements: I Both variance and standard devi...

    Text Solution

    |

  6. Variance is always independent of the change of

    Text Solution

    |

  7. The standard deviation of the observations 5, 5,5,5,5 is

    Text Solution

    |

  8. Consider the following frequency distribution If the total of ...

    Text Solution

    |

  9. The average marks obtained by the students in a class are 43. If the a...

    Text Solution

    |

  10. If two lines of regression are perpendicular, then the correlation coe...

    Text Solution

    |

  11. Marks obtained by 7 students in a subject are 30,55,75,50,50,60,39. Th...

    Text Solution

    |

  12. If the algebraic sum of deviations of 20 observation measured from 23 ...

    Text Solution

    |

  13. What is the standard deviation of numbers 7, 9, 11. 13, 15

    Text Solution

    |

  14. The mean of 10 observations is 5. If 2 is added to each observation an...

    Text Solution

    |

  15. The median of 27 observations of a variable is 18 Three more observati...

    Text Solution

    |

  16. Represent the following data by frequency curve :

    Text Solution

    |

  17. What is the mean of n odd natural numbers. (a)n (b)(n+1)/(2) (c)(n(...

    Text Solution

    |

  18. The arithmetic mean of numbers a, b, c,d, e is M What is the value of ...

    Text Solution

    |

  19. The monthly family expenditure (in %) on n different items are follow...

    Text Solution

    |

  20. If the mean of few observation is 40 and standard deviation is 8. then...

    Text Solution

    |