close
    how do you figure the variance for a group of numbers

    0  Views: 589 Answers: 1 Posted: 12 years ago

    1 Answer

    1. Find the arithmetic mean (average)
    => Sum of all values in the set, divided by the numbers of elements in the set
    2. Find the sum of the squares of all values in the set
    3. Divide output of (2) over the numbers of elements in the set
    4. Substract the square of mean (1) from the output of (3)
    5. Take the square root of the outcome of (4)
    Example:
    Set A={1,3,4,5,7}
    1. (1+3+4+5+7)/5 = 4
    2. (1*1+3*3+4*4+5*5+7*7)=1+9+16+25+49 = 100
    3. 100 / 5 = 20
    4. 20 - 4*4=20-16 = 4
    5. SQRT(4) = 2



    Top contributors in Science & Mathematics category

     
    ROMOS
    Answers: 53 / Questions: 0
    Karma: 2940
     
    Bob/PKB
    Answers: 63 / Questions: 0
    Karma: 1830
     
    Colleen
    Answers: 84 / Questions: 0
    Karma: 1760
     
    Benthere
    Answers: 1 / Questions: 0
    Karma: 1670
    > Top contributors chart

    Unanswered Questions

    chefkevincottle789club
    Answers: 0 Views: 3 Rating: 0
    ysb66live1
    Answers: 0 Views: 4 Rating: 0
    b52clubbfit
    Answers: 0 Views: 8 Rating: 0
    anand-gcom1
    Answers: 0 Views: 4 Rating: 0
    789win1 Asia
    Answers: 0 Views: 5 Rating: 0
    sunwincampos08
    Answers: 0 Views: 7 Rating: 0
    bpmfilmhello88
    Answers: 0 Views: 6 Rating: 0
    > More questions...
    466445
    questions
    722243
    answers
    785371
    users