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Expression in terms of X for the variance

  1. Mar 11, 2007 #1
    1. 'Find an expression in terms of x for the variance of: 9,4,x,3'
    Give your answer in the form of ax^2 + bx + c

    I would usually give you some information of how I could possibly tackle this question but unfortunetly I have no idea. Could someone shed some light? Thanks
     
  2. jcsd
  3. Mar 11, 2007 #2

    arildno

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    Well, given four numbers, 9,4, BLOING,3, how would you normally calculate the variance related to this set of numbers?
     
  4. Mar 11, 2007 #3
    well I'd use the statistical formula for variance
    Variance = Sum of (x - xbar)^2 / n
     
  5. Mar 11, 2007 #4

    arildno

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    So, what is the average value, xbar, with the numbers that have been given you?
     
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