Home
Class 11
ECONOMICS
Following are the marks obtained by 25 s...

Following are the marks obtained by 25 students in economics.
Find out the mean marks by using Direct and Short-cut Method.
`{:("Marks",10,20,30,40,50,60),("Number of Students",5,2,3,8,4,3):}`

Text Solution

Verified by Experts

Direct Method:

`barX=(sum fX)/(sum f)`
`barX=(880)/25=35.2`
Mean Marks of 25 Students in Economics = 35.2.
Short-cut Method:

`barX=A+(sumfd)/(sumf)`
`=40+(-120)/25=40-(120)/25`
`=40-4.8=35.2`
Thus, Mean Marks = 35.2.
Promotional Banner

Topper's Solved these Questions

  • MEASURES OF CENTRAL TENDENCY - ARITHMETIC MEAN

    TARUN JAIN & VK OHRI|Exercise 5. NCERT Questions (With Hints to Answers)|12 Videos

  • INDEX NUMBERS

    TARUN JAIN & VK OHRI|Exercise NCERT Questions (With Hints to Answers)|12 Videos

  • MEASURES OF CENTRAL TENDENCY MEDIAN AND MODE

    TARUN JAIN & VK OHRI|Exercise NCERT Questions (With Hints to Answers)|5 Videos

Similar Questions

Explore conceptually related problems

Following are the marks obtained by 20 students in statistics. Find out coefficient of variation of the marks.

The table shows the marks obtained by 25 students in a class test. Find the mean of the marks obtained

Distribution of marks obtained by 100 student of a class is given below . Find out the median marks {:("Marks",0,5,10,15,20,25,30,35,40,45),("Number of Students",4,6,15,5,8,12,28,14,3,5):}

The following table represent marks obtained by 100 students in a test. Find mean marks of the students.

The following table gives the marks obtained by some students. Calculate the median marks obtained by the students. {:("Marks",0-5,5-10,10-15,15-20,20-25,25-30,30-35,35-40,40-45),("Number of Students"," "6," "12," "17," "30," "10," "10," "8," "5," "2):}

Find out median marks from the following data : {:("Marks",0-10,10-20,20-30,30-40,40-50),("Number of Students"," "8," "30," "40," "12," "10):}

Following is the pocket allowance of 10 students. Find out arithmetic mean using Short-cut Method. {:("Pocket Allowance(Rs.)",15,20,30,22,25,18,40,50,55,65):}

The following table shows marks in English secured by students of Class X in your school in their examination. Calculate mean marks using Direct Method. {:("Marks",0-10,10-20,20-30,30-40,40-50),("Number of Students"," "20," "24," "40," "36," "20):}

TARUN JAIN & VK OHRI-MEASURES OF CENTRAL TENDENCY - ARITHMETIC MEAN-Illustration
  1. In the following frequency distribution, the frequency of the class i...

    Text Solution

    |

  2. If the arithmetic mean of the following series is 115.86, find the mis...

    Text Solution

    |

  3. Follwing are the marks obtained by 8 students in Statistics. Calcula...

    Text Solution

    |

  4. Following are the marks obtained by 25 students in economics. Find o...

    Text Solution

    |

  5. Calculate mean salary by Step-deviation Method of the following data:

    Text Solution

    |

  6. Calculate mean from the following data: {:("Marks",10-20,10-30,10-40...

    Text Solution

    |

  7. A train runs 25 miles at a speed of 30 mph, another 50 miles at a spee...

    Text Solution

    |

  8. If the average salary of a firm is Rs. 400 and the number of workers ...

    Text Solution

    |

  9. The mean of 5 observations is 7. Later on, it was found that two obser...

    Text Solution

    |

  10. The mean monthly salary paid to all employees in a certain company was...

    Text Solution

    |

  11. Find the missing information in the following table: {:(,,A,,B,,C,,"...

    Text Solution

    |

  12. In a class of 50 students 10 have failed and their average of marks is...

    Text Solution

    |

  13. Following are the marks of 37 students: {:("Marks",4,6,8,10,12,14),(...

    Text Solution

    |

  14. Find out the arithmetic mean by the Step-deviation Method of the follo...

    Text Solution

    |

  15. Calculate the mean marks from the following data: {:("Marks",20-25,...

    Text Solution

    |

  16. Find out the arithmetic mean from the following data: {:("Marks (les...

    Text Solution

    |

  17. Calculate the weighted mean from the following data: {:("Marks",60,7...

    Text Solution

    |

  18. Mean of 100 observations is found to be 40. If at the time of computat...

    Text Solution

    |

  19. The mean monthly salary paid to 77 employees in a company was Rs. 78. ...

    Text Solution

    |

  20. The average marks of 39 students of a class is 50. The marks obtained ...

    Text Solution

    |