+ Reply to Thread
Results 1 to 3 of 3

Thread: Probability Problem To Resolve

  1. #1
    Points: 7, Level: 1
    Level completed: 13%, Points required for next Level: 43

    Posts
    2
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Probability Problem To Resolve




    Hi,

    I need the solution to this problem to be able to resolve a situation at work. I believe some probability equation must be involved.

    Problem:

    There are 60 math teachers at a math competition conference meeting. All 60 teachers are asked to take the same math test to compare average score results. Unfortunately, there is no one else available to be grading all the tests so the teachers have to grade the tests themselves.

    To eliminate any kind of margin of error, each teacher is asked to grade 20 tests of their peers, selected at random. Each graded test corresponds to one score. At the end, the teacher's final score for the test will be equal to the average of all the scores that have been graded from the other teachers.

    How many scores will each teacher receive if all 60 teachers grade 20 tests of their peers selected at random?

  2. #2
    Devorador de queso
    Points: 95,705, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Awards:
    Posting AwardCommunity AwardDiscussion EnderFrequent Poster
    Dason's Avatar
    Location
    Tampa, FL
    Posts
    12,931
    Thanks
    307
    Thanked 2,629 Times in 2,245 Posts

    Re: Probability Problem To Resolve

    If I'm understanding you correctly then on average the answer is 20
    I don't have emotions and sometimes that makes me very sad.

  3. #3
    Points: 7, Level: 1
    Level completed: 13%, Points required for next Level: 43

    Posts
    2
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Re: Probability Problem To Resolve


    Hi Dason,

    Thank you for your reply. Since there are 60 teachers and they are all grading 20 tests selected at random, how can we make sure that each of the teachers receive the same amount of graded tests in the end? Shouldn't there be a probability variable that takes into account the fact that each teacher's test has 1 chance out of 3 to be graded by any given teacher? (ratio between 60/20= 3)

    The total amount of final scores in the end is still 60 (1 per teacher) but we will be averaging 60 x 20 graded scores = 1200 scores.

    I just want to figure out the percentage of graded tests per teacher that will be reviewed by others and compare that data with the total number of graded scores if that makes any sense.

+ Reply to Thread

           




Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts






Advertise on Talk Stats