Home
Class 14
MATHS
The average of n observations is 40. If ...

The average of n observations is 40. If one observation of value 80 is added, then the average of all the observations is 41. What is the value of n ?

A

43

B

38

C

40

D

39

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • ALLIGATION

    GAGAN PRATAP |Exercise ALLIGATION (SHEET-3)|25 Videos
  • BOAT & STREAM

    GAGAN PRATAP |Exercise MULTIPLE CHOICE QUESTIONS|42 Videos

Similar Questions

Explore conceptually related problems

The average of n observation is 40. If two observation of 50 and 60 are added, then the average of all the observations will be 41. What is the value of n?

The mean of 10 observation is 15. If one observation 15 is added, then find the new mean.

The AM of n observations is M. If the sum of n-4 observations is a, then the mean of remaining 4 observations is

The A.M. of n observation is X. If the sum of n-4 observation sis K, then the mean of remaining observations is

The mean of 10 observations is 15. If one observation 15 is added, then the new mean is 16 (b) 11 10 (d) 15

The average of 10 observations is 14.4. If the average of first 4 observations is 16.5. The average of remaining 6 observations is:

The mean of 9 observations is 15 .If one more observation is added to the series,the mean becomes 16 .The value of 10 th observation is

GAGAN PRATAP -AVERAGE-Multiple Choice Questions
  1. The average weight of a certain number of students in a group is 72 kg...

    Text Solution

    |

  2. While tabulation of marks scored in an examination by the students of ...

    Text Solution

    |

  3. The average of n observations is 40. If one observation of value 80 is...

    Text Solution

    |

  4. The average age of 24 students is 15.5 years. The age of the teacher i...

    Text Solution

    |

  5. Three numbers are such that if the average of any two of them is added...

    Text Solution

    |

  6. The average of eleven numbers is 68. The average of the first four num...

    Text Solution

    |

  7. The average of thirteen numbers is 80. The average of the first five n...

    Text Solution

    |

  8. The average of 24 numbers is 56. The average of the first 10 numbers i...

    Text Solution

    |

  9. The average marks of 30 boys is 88, and when the top scores were exclu...

    Text Solution

    |

  10. A batsman scores 92 runs in his 15th innings, which increases his batt...

    Text Solution

    |

  11. A batsman makes 100 runs in the 25th match of his career. His average ...

    Text Solution

    |

  12. The average run of a batsman in his 23 matches is 62. He scores 122 in...

    Text Solution

    |

  13. A cricket batsman had certain average of runs in his 91 innings. In th...

    Text Solution

    |

  14. A cricketer had a certain average of runs for his 64 innings. In his 6...

    Text Solution

    |

  15. A batsman scores certain runs in 72 innings. In next two innings he sc...

    Text Solution

    |

  16. A batsman scores 556 run in 26th, 27th, 28th and 29th innings together...

    Text Solution

    |

  17. The batting average for 40 innings of a cricket player is 50 runs. His...

    Text Solution

    |

  18. A cricketer whose bowling average is 24.85, runs per wicket, takes 5 w...

    Text Solution

    |

  19. The bowling average of a cricketer was 12.4. He improves his bowling a...

    Text Solution

    |

  20. The average run rate of a cricket team during the first 20 overs is 4....

    Text Solution

    |