Answers: 3
![E[X]=\displaystyle\sum_xx\,P(x)=0\cdot0.125+1\cdot0.428+\cdots+4\cdot0.083](/tpl/images/0597/1074/dc778.png)
![E[X]=1.596](/tpl/images/0597/1074/990fa.png)
![E[X^2]=\displaystyle\sum_xx^2\,P(x)=0^2\cdot0.125+1^2\cdot0.428+\cdots+4^2\cdot0.083](/tpl/images/0597/1074/cd47f.png)
![E[X^2]=3.752](/tpl/images/0597/1074/7604b.png)
is![V[X]=E[(X-E[X])^2]=E[X^2-2X\,E[X]+E[X]^2]=E[X^2]-E[X]^2](/tpl/images/0597/1074/8b0ab.png)
![V[X]=2.156](/tpl/images/0597/1074/b1d15.png)
![\sqrt{V[X]}\approx\boxed{1.468}](/tpl/images/0597/1074/9efc8.png)
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