Let X be a discrete random variable. The probability distribution of X

Let X be a discrete random variable. The probability distribution of X is given below: X: 30 10 –10 P(X): 15 310 12 Then E(X) is equal to(a) 6(b) 4(c) 3(d) –5

Answer» Let X be a discrete random variable. The probability distribution of X is given below:

X:	30	10	–10
P(X):	$\frac{1}{5}$	$\frac{3}{10}$	$\frac{1}{2}$

Then E(X) is equal to

(a) 6

(b) 4

(c) 3

(d) –5

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Let X be a discrete random variable. The probability distribution of X is given below: X: 30 10 –10 P(X): 15 310 12 Then E(X) is equal to(a) 6(b) 4(c) 3(d) –5

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