Palash Nandi

Covariance is the concept of variance to multiple random variables. Instead of measuring the fluctuation of a single random variable, the covariance measures the fluctuation of two variables with each other.

  1. Var[X+Y] = Var[X] + Var[Y] + 2.XY.Cov(X,Y) ?

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A Random variable is a variable whose value is determined by some random event. The Expectation of random variable ‘X’ i.e. E[X] is the central tendency of X when picked once randomly from the sample space (i.e. a homogeneous/ heterogeneous space of all possible outcome).

  1. E[X+c] = ?

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