Question 847506
mean = 0*0.05 + 1 * 0.16 + 2*0.21 + 3*0.34 + 4 * 0.22 + 5* 0.02 = {{{highlight(2.58)}}}

n = 6

find the second moment

0^2*0.05 + 1^2 * 0.16 + 2^2*0.21 + 3^2*0.34 + 4^2 * 0.22 + 5^2* 0.02 = 8.08

Take second moment - (first moment)^2

= {{{8.08 - 2.58^2 = 1.423}}}

That's our variance. To find SD square root.

={{{sqrt(1.423) = highlight(1.19)}}}