Q9 of 77 Page 32

Let X be a discrete random variable. Then the variance of X is

Let X be a random variable whose possible values


Possibilities p(x1), p(x2),…………p(xn)respectively.


Let = E (X) be the mean of X. The variance of X, denoted by Var (X) or defined as









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5

If X is a random-variable with probability distribution as given below:

The value of k and its variance are


 6

The probability distribution of a discrete random variable X is given below:

The value of E(X) is


 7

For the following probability distribution:

The value of E(X) is


 8

For the following probability distribution:

















X:



1



2



3



4



P(X):



1/10



1/5



3/10



2/5



The value of E(X2) is