Home
Class 9
MATHS
The mean of 90 items was found to be 45....

The mean of 90 items was found to be 45. Later on it was discovered that two items were misread as 26 and 19 instead of 62 and 09 respectively. The correct mean is

A

49

B

45

C

45.3

D

49.3

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • STATISTICS

    MTG IIT JEE FOUNDATION|Exercise Exercise (Match the following)|2 Videos

  • STATISTICS

    MTG IIT JEE FOUNDATION|Exercise Exercise (Assertion and Reason Type)|5 Videos

  • STATISTICS

    MTG IIT JEE FOUNDATION|Exercise NCERT SECTION (Exercise 14.4)|7 Videos

  • QUADRILATERALS

    MTG IIT JEE FOUNDATION|Exercise Olympiad/HOTS CORNER|15 Videos

  • TRIANGLES

    MTG IIT JEE FOUNDATION|Exercise OLYMPAID/ HOTS CORNER|10 Videos

Similar Questions

Explore conceptually related problems

The mean of 100 items was found to be 64. Later on it was discovered that two items were misread as 26 and 9 instead of 36 and 90 respectively. The correct mean is

The mean of 100 iterms was found to be 64. Later on it was discovered that two items were misread as 26 and 9 instead of 36 and 90 respectively. Find the correct mean.

The mean of 150 items was found to be 60. Later on, it was discoverved that the values of two items were misread as 52 and 8 instead of 152 and 88 respectively. Find the correct mean.

The mean of 200 items was 50. Later on,it was discovered that the two items were misread as 92 and 8 instead of 192 and 88. Find the correct mean.

The mean of 16 items was found to be30.On rechecking,it was found that two items were wrongly taken as 22 and 18 instead of 32 and 28, respectively.Find correct mean.

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.

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, the correct mean is

The mean of 50 numbers is 30. Later it was discovers that two entries were wrongly entered as 82 and 13 instead of 28 and 31. Find the correct mean.

For a group of 200 candidates,mean was found to 40 but it was discovered later that the scores of 43 and 35 were misread as 34 and 53 respectively.Then the correct mean is

MTG IIT JEE FOUNDATION-STATISTICS-Exercise (Multiple Choice Question)
  1. If x is the mean of x1, x2, ..... ,xn, then for a ne0, the mean of ax...

    Text Solution

    |

  2. The mean of the marks scored by 40 students was found to be 35. Later ...

    Text Solution

    |

  3. The mean of 90 items was found to be 45. Later on it was discovered th...

    Text Solution

    |

  4. The mean of 53 observations is 36. Out of these observations, the mean...

    Text Solution

    |

  5. There are 50 numbers. Each number is subtracted from 43 and the mean o...

    Text Solution

    |

  6. The median of the numbers 9, 5, 7, 17, 13, 18, 13, 9, 5, 17, 13, 12, 1...

    Text Solution

    |

  7. The median of the numbers 45, 34, 65, 48, 93, 54, 22, 86, 45, 87 is

    Text Solution

    |

  8. Mode of the data 51, 14, 71, 15, 91, 2, 51, 19, 41, 51, 18, 15, 51 is

    Text Solution

    |

  9. For drawing a frequency polygon of a continuous frequency distribution...

    Text Solution

    |

  10. The marks obtained by 20 students of a class in a test (out of 50) are...

    Text Solution

    |

  11. The class mark of the class 150 - 170 is

    Text Solution

    |

  12. The mean of eight numbers is 40. If one number is excluded, their mean...

    Text Solution

    |

  13. The median of the data arranged in ascending order 8, 9, 12, 18, (x + ...

    Text Solution

    |

  14. The points scored by a kabaddi team in a series of matches are as foll...

    Text Solution

    |

  15. The marks obtained by 12 students of a class in a test are 36, 27, 5, ...

    Text Solution

    |

  16. Find the mean of the following distribution:

    Text Solution

    |

  17. The class marks of a frequency distribution are 104, 114, 124, 134, 14...

    Text Solution

    |

  18. Find the mean of the following marks of 20 students on a screening tes...

    Text Solution

    |

  19. The maximum temperatures (in degree celcius) for a city in North India...

    Text Solution

    |

  20. The mean of 100 observations is 50. If one of the observations which w...

    Text Solution

    |