Let X be a positive variable with E(X) =5 and E(X)^2 =31.25

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Please find an upper bound for P(X>=10) using Markov's and Chebyshev's

Please state which is which. I'm not very good at stats and this is a homework problem :P

Thanks!
 
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Matt Wirtz said:
Please find an upper bound for P(X>=10) using Markov's and Chebyshev's

Please state which is which. I'm not very good at stats and this is a homework problem :P

Thanks!

Welcome to the PF, Matt. We require that you show the relevant equations and your attempt at a solution, before we can offer you tutorial help.

Please show us how you would start this problem's solution...
 
berkeman said:
Welcome to the PF, Matt. We require that you show the relevant equations and your attempt at a solution, before we can offer you tutorial help.

Please show us how you would start this problem's solution...

That's where i 'm a little lost on this one. I have no start but i need to learn how to at least. Step by step i guess.

I hope that's somewhat acceptable by your guy's terms :)
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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