If I am comparing the riskiness of making decisions using standard deviation measure of dispersion with weighted values ...

     If I am comparing the riskiness of making decisions using   standard deviation measure of dispersion with weighted values on the   outcomes, what standard deviation do I get and how do I get it       Probability   of outcome   .20-future   rivalry very high -value 5   .40-future   rivalry high-value 4   .20-future   rivalry moderatevalue 3   .15-future   rivalry low-value 2   .05-future   rivalry very low-value 1   What   is standard deviation?       Second   scenario   Probability   of outcome   .10-future   rivalry very high-value 5   .10-future   rivalry high-value 4   .15-future   rivalry moderate-value 3   .20-future   rivalry low-value 2   .45-future   rivalry very low-value 1   What   is standard deviation?