Question 1100503
Were you given this discrete probability table or did you compute it? 
Using 25% and the binomial probability function, you would get,
0,0.237
1,0.396
2,0.264
3,0.088
4,0.015
5,0.001
I'll show you how to solve with the data you provided.
If you need to modify, just follow the same procedure.
Find the mean,
{{{mu=sum(x*P(x))}}}
{{{mu=1.454}}}
Then find,
{{{V=sum((x-mu)^2*P(x))}}}
{{{V=1.202}}}
and finally,
{{{sigma=sqrt(V)}}}
{{{sigma=1.096}}}

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*[illustration vc5.JPG].