Question 452695
a.  0.09

b.  0.61 + 0.09 = 0.70

c.  1 - 0.09 = 0.91

d.  {{{mu}}} = E(X) = 0*0.02 + 1*0.28 + 2*0.61 + 3*0.09 = 1.77

e.  variance = {{{sigma^2 = E(X^2) - (E(X))^2 = 0^2*0.02 + 1^2*0.28 + 2^2*0.61 + 3^2*0.09 - 1.77^2 = 0.3971}}}

==> standard deviation = {{{sigma = sqrt(0.3971)=  0.63}}}