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ooh statistics.....dont remember this but tiere's a formula for Standard Deviation...google it lol

\[\sum_{n=1}^{3}i^(n-1)\]

that should read i^(n-1)

what's that?

sum?

What is that sum for formula for?

but the i is raised to the n-1

yeah its a different problem i figured out the other one ill use my calculator

So what's the sum asking you to do? You want to find an explicit formula for the sum?

no you need to find the sum of all those terms

yeah u do i^1+i^2+i^3 and add them up

you start with 1 because thats what n=

nev ermind its fine..can you look at my probability question

no i gotta go

if you post it on here, someone will be sure to help. there's a lot of people on right now

okk

good luck