Expression in terms of X for the variance

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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
 

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  • #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?
 
  • #3
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well I'd use the statistical formula for variance
Variance = Sum of (x - xbar)^2 / n
 
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arildno
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So, what is the average value, xbar, with the numbers that have been given you?
 

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