Probability

For the probability distribution of a discrete random variable $X$ as given below, then mean of $X$ is

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X = x	-2	-1	0	1	2	3
P(X = x)	\( \frac{1}{10} \)	\( K+\frac{2}{10} \)	\( K+\frac{3}{10} \)	\( K+\frac{3}{10} \)	\( K+\frac{4}{10} \)	\( K+\frac{2}{10} \)