The probability distribution of a random variable X is given by

Question

X=x	0	1	2	3	4
P(X=x)	0.4	0.3	0.1	0.1	0.1

The variance of X is 

$(a)\;1.76 \\(b)\;2.45 \\(c)\;3.2 \\(d)\;4.8$