# Expression in terms of X for the variance

## Main Question or Discussion Point

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

arildno
Homework Helper
Gold Member
Dearly Missed
Well, given four numbers, 9,4, BLOING,3, how would you normally calculate the variance related to this set of numbers?

well I'd use the statistical formula for variance
Variance = Sum of (x - xbar)^2 / n

arildno