Home
Class 11
MATHS
The mean and standard deviation of 20 ob...

The mean and standard deviation of 20 observations are found to be 10 and 2 respectively. On rechecking, it was found that an observation 8 was incorrect. Calculate the correct mean and standard deviation if wrong item is omitted.

Promotional Banner

Topper's Solved these Questions

  • STATISTICS

    MODERN PUBLICATION|Exercise EXERCISE|98 Videos

  • SETS

    MODERN PUBLICATION|Exercise EXERCISE|381 Videos

  • STRAIGHT LINES

    MODERN PUBLICATION|Exercise EXERCISE|304 Videos

Similar Questions

Explore conceptually related problems

The mean and standard deviation of 20 observations are found to be 10 and 2. respectively. On rechecking, it was found that an observation 8 was incorrect. Calculate the correct mean and standard deviation in each of the following cases: (i) If wrong item is omitted. (ii) If it is replaced by 12.

Calculate the mean and standard deviation of the distribution :

Calculate the mean and standard deviation of the distribution :

Calculate the mean and standard deviation of the distribution :

Calculate the mean and standard deviation of the distribution :

Calculate the mean and standard deviation of the distribution :

Calculate the mean and standard deviation of the distribution :

Calculate the mean and standard deviation of the distribution :

Calculate the mean and standard deviation for the following distribution :

MODERN PUBLICATION-STATISTICS-EXERCISE
  1. From the data given below, state which group is more variable :

    Text Solution

    |

  2. In a study to test the effectiveness of new variety of seeds, an exper...

    Text Solution

    |

  3. The weights of a group of children at 6 month are given below: Find...

    Text Solution

    |

  4. In the study of 79 diabetic patients, the following data are obtained....

    Text Solution

    |

  5. Two plants A and B of a factory show following results about the numbe...

    Text Solution

    |

  6. The following values are calculated in respect of heights and weights ...

    Text Solution

    |

  7. The sum and sum of squares corresponding to length x (in cm) and weigh...

    Text Solution

    |

  8. From the data given below, state which group is more variable, A or B ...

    Text Solution

    |

  9. From the prices of shares X and Y below, find out which is more stable...

    Text Solution

    |

  10. The following is the record of goals scored by team A in a football se...

    Text Solution

    |

  11. The mean of first 11 terms of Fibonacci sequence : 1,1,2, 3, 5, 8, 13,...

    Text Solution

    |

  12. If each of the observations x1, x2, ....xn is increased by an amount ‘...

    Text Solution

    |

  13. Find the mean and standard deviation for the following data :

    Text Solution

    |

  14. Find the average earnings (using step-deviation method) and the standa...

    Text Solution

    |

  15. The yields of wheat for 50 experimental fields are given below. Find t...

    Text Solution

    |

  16. The mean and standard deviation of marks obtained by 50 students of a ...

    Text Solution

    |

  17. From a frequency distribution consisting of 18 observations, the mean ...

    Text Solution

    |

  18. The mean and standard deviation of 20 observations are found to be 10 ...

    Text Solution

    |

  19. The mean and standard deviation of 20 observations are found to be 10 ...

    Text Solution

    |

  20. The mean and standard deviation of a group of 100 observations were fo...

    Text Solution

    |