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thereddevils
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Homework Statement
A random variable X takes values 1,2,...,n with equal probabilities. Determine the expectation, R for X and show that the variance, Q^2 is given by 12Q^2=n^2-1. Hence, find
P(|X-R|>Q) in the case n=100
Homework Equations
The Attempt at a Solution
I can show that 12Q^2=n^2-1 but not the latter.
Substituting n=100, R=50.5 and Q=28.87
P(|X-50.5|>28.87)=P(X-50.5>28.87)+P(x-50.5<-28.87)
How can i continue from here?