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

    0  Views: 625 Answers: 1 Posted: 13 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

    bcx88
    Answers: 0 Views: 6 Rating: 0
    Tin tức alluvia city
    Answers: 0 Views: 6 Rating: 0
    Sunwin
    Answers: 0 Views: 5 Rating: 0
    Ha Giang Massage
    Answers: 0 Views: 9 Rating: 0
    12 days vietnam itinerary
    Answers: 0 Views: 10 Rating: 0
    S666
    Answers: 0 Views: 13 Rating: 0
    v99autos
    Answers: 0 Views: 10 Rating: 0
    > More questions...
    505628
    questions
    749726
    answers
    845640
    users