1. The problem statement, all variables and given/known data 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 2. Relevant equations 3. 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?