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    Jensen's inequality formula

    Jensen's inequality generalizes the statement that the secant line of a convex function lies above the graph of the function, which is Jensen's inequality for two points: the secant line consists of weighted means of the convex function (for t ∈ [0,1]), It's pretty hard for me!!
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    Probability matrix

    thanks David Harper CFA FRM, Statistical probability makes me very tired
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    what is a z table

    thanks David Harper CFA FRM
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    Difference between covariance and Var(X+Y)

    thanks @brian.field và @ShaktiRathore !!
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