Statistic and Probability

• Mean "The expected value"


  $µ=$$Σ[x*P(x)]$
• Variance


  $σ^2=$$Σ[x^2*P(x)]-μ^2$
• Standard Deviation


  $σ=$$√Σ[x^2*P(x)]-μ^2$
• Cumulative Distribution Function


  $f(x)=$$p(X≤x) , -∞<x<∞$