Let the mean and the standard deviation of the probability distribution be μ and σ, respectively. If σ-μ=2, then σ+μ is equal to ____.

Let the mean and the standard deviation of the probability distribution

X	$\displaystyle \alpha$	$\displaystyle 1$	$\displaystyle 0$	-$\displaystyle 3$
P(X)	$\displaystyle \frac{1}{3}$	K	$\displaystyle \frac{1}{6}$	$\displaystyle \frac{1}{4}$

be $\displaystyle \mu$ and $\displaystyle \sigma$, respectively. If $\displaystyle \sigma-\mu=2$, then $\displaystyle \sigma+\mu$ is equal to $\displaystyle \_\_\_\_$.