Home
Class 14
MATHS
The mean of 5 observations is 60, the...

The mean of 5 observations is 60, the mean of 10 observations is 30 and the mean of 15 observations is 20. The mean of all the 30 observations is (a) 20        (b) 25        (c) 30     (d) 40

Promotional Banner

Topper's Solved these Questions

  • AREA

    RS AGGARWAL|Exercise All Questions|473 Videos

  • BANKERS DISCOUNT

    RS AGGARWAL|Exercise All Questions|20 Videos

Similar Questions

Explore conceptually related problems

The mean of 20 observations is 30. If the mean of first 15 observations is 32, find the mean of last 5 observations.

The mean of first three observations is 15 and the mean of next two observation is 20. The mean of all five observations is-

If the mean of 10 observations is 15, then the sum of these observations is

Mean of 35 observations is 75 .The mean of first 18 observations is 70 and the mean of last 18 observations is 80 .Then the 18^(th ) observation is

Mean of 35 observations is 75 .The mean of first 18 observations is 70 and the mean of last 18 observations is 80 .Then the 18^(" th ") observation is

The means of 5 observations is 16. Find the sum of these observations.

The mean of 10 observations is 12. If mean of first 6 observations is 13. Find the mean of remaining 4 observations.

The mean of 9 observations is 36. If the mean of the first 5 observations is 32 and that of the last 5 observations is 39, then the fifth observation is

The mean of 9 observations is 36 .If the mean of the first 5 observations is 32 and that of the last 5 observations is 39 ,then the fifth observation is

RS AGGARWAL-AVERAGE-All Questions
  1. In a class there are 32 boys and 28 girls. The average age of the b...

    Text Solution

    |

  2. The average weight of 16 boys in a class is 50.25 kgs and that of t...

    Text Solution

    |

  3. The mean of 5 observations is 60, the mean of 10 observations is 30...

    Text Solution

    |

  4. The average expenditure of a man for the first five months of a yea...

    Text Solution

    |

  5. A school has 4 sections of Chemistry in Class X having 40, 35, 45 a...

    Text Solution

    |

  6. If the average of m numbers is n^2 and that of n numbers is m^2 ...

    Text Solution

    |

  7. The average of five consecutive numbers is x . If the next two n...

    Text Solution

    |

  8. A person purchases 1 kg of tomatoes from each of the 4 places at th...

    Text Solution

    |

  9. In a certain factory there are five workers A ,\ B ,\ C ,\ D and E ...

    Text Solution

    |

  10. A car owner buys petrol at Rs 17, Rs 19 and Rs 20 per litre for thr...

    Text Solution

    |

  11. The average of six numbers is x and the average of three of thes...

    Text Solution

    |

  12. Out of 9 persons, 8 persons spent Rs 30 each for their meals. The n...

    Text Solution

    |

  13. There were 35 students in a hostel. If the number of the students i...

    Text Solution

    |

  14. The average price of three items of furniture is Rs 15000. If their...

    Text Solution

    |

  15. Of the four members, the first is twice the second, the second is o...

    Text Solution

    |

  16. Out of three numbers, the first is twice the second and is half of ...

    Text Solution

    |

  17. Of the three numbers, the first is twice the second and the second ...

    Text Solution

    |

  18. Of the three numbers, the average of the first and the second is gr...

    Text Solution

    |

  19. The average of 50 numbers is 38. If the numbers 45 and 55 are disca...

    Text Solution

    |

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

    Text Solution

    |