Home
Class 9
MATHS
The mean of 100 items was found to be...

The mean of 100 items was found to be 30. If at the time of calculation two items were wrongly taken as 32 and 12 instead of 23 and 11, find the correct mean.

Text Solution

AI Generated Solution

Promotional Banner

Topper's Solved these Questions

  • LINES AND ANGLES

    RD SHARMA ENGLISH|Exercise All Questions|183 Videos
  • NUMBER SYSTEM

    RD SHARMA ENGLISH|Exercise All Questions|130 Videos
RD SHARMA ENGLISH-MEASURES OF CENTRAL TENDENCY-All Questions
  1. Find the sum of the deviations of the variate values 3, 4, 6, 8, 14 ...

    Text Solution

    |

  2. The mean of 40 observations was 160. It was detected on rechecking ...

    Text Solution

    |

  3. The mean of 100 items was found to be 30. If at the time of calcula...

    Text Solution

    |

  4. The mean monthly salary of 10 members of a group is Rs. 1445, one m...

    Text Solution

    |

  5. The mean of 10 number is 20. If 5 is subtracted from every numbe...

    Text Solution

    |

  6. The mean of 16 numbers is 8. If 2 is added to every number, what ...

    Text Solution

    |

  7. The mean of 5 number is 18. If one numbers is excluded, their me...

    Text Solution

    |

  8. If the mean of five observations x , x + 2 , x + 4 , x + 6 , x + 8...

    Text Solution

    |

  9. If x1, x2, x3,....xn are n values of a variable X such that Find the ...

    Text Solution

    |

  10. The sum of the deviations of a set of n values x1, x2 ,xn measured fro...

    Text Solution

    |

  11. If the heights of 5 persons are 140cm, 150cm, 152cm, 158cm and 161c...

    Text Solution

    |

  12. Find the mean of 994, 996, 998, 1002 and 1000

    Text Solution

    |

  13. Find the mean of first five natural numbers.

    Text Solution

    |

  14. Find the mean of all factors of 10.

    Text Solution

    |

  15. Find the mean of first 10 even natural numbers.

    Text Solution

    |

  16. Find the mean of x, x+2, x+4, x+6, x+8

    Text Solution

    |

  17. Find the mean of first five multiples of 3.

    Text Solution

    |

  18. Following are the weights (in kg) of 10 new born babies in a hospit...

    Text Solution

    |

  19. The percentage of marks obtained by students of a class in mathemat...

    Text Solution

    |

  20. The numbers of children in 10 families of a locality are: 2, 4, 3, 4...

    Text Solution

    |