Averaging

Discussion in 'Math' started by Lightfire, Mar 6, 2011.

  1. Lightfire

    Thread Starter Well-Known Member

    Oct 5, 2010
    690
    21
    Hi,

    There's a lot of differences between public and private schools' averaging here in the Philippines.

    Private schools often gives high grades.

    So, I am asking you now the correct averaging.

    CATEGORY---------PERCENTAGE---ITEMS-----SCORE--PUPIL PERCENTAGE

    PROJECT----------------10%-------10%------95%/100%--------9.5
    RECITATION--------------15%-----15%-------90%/100%--------13.5
    HOMEWORK/SEATWORK---10%-----200--------185/200----------9.25
    MONTHLY EXAM----------20%------50---------50/50------------20
    PERIODICAL EXAM--------30%------50---------50/50------------30
    QUIZ---------------------15%------25--------20/25-------------12

    INSTRUCTIONS:

    1. I divided my score to a total score. Like 20÷25.
    2. I multiply the answer by 100. Like 0.8x100
    3. I multiply the answer by 0.15. Like 80x0.15
    The answer was 12.

    Note: If you noticed, I add "0." before the category's percentage. Like "0.15"

    My average will be 94.25. Right?


    If there is something wrong please let me know.


    P.S. The averaging system I made is the averaging system of most public schools here in the Philippines.


    Thank you and answers will be greatly appreciated.


    God bless.
     
  2. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,685
    900
  3. Lightfire

    Thread Starter Well-Known Member

    Oct 5, 2010
    690
    21
    Yes. :)

    but if you noticed, my quiz there is only 12 which is to be 13.5.

    so 13.5 would be correct? my formula/method is 20 divided by 25. I multiplied the answer to 50. Then add more 50. Then times it to 0.15.

    thanks.
     
  4. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,685
    900
    The process of doing a weighted average is the same, regardless of the values assigned for the individual weights. You just need to update your values. You have added a couple of new columns, and your addition seems correct. Your current average is 94.25%, which is what you calculated. So, you seem to have the right idea.

    John
     
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