Question 1080049
E(X)=mean=0*0.1+1*0.4+2*0.3+3*0.1+4*0.1=1.7
V(X)=1.7^2*0.1+0.7^2*0.4+0.3^2*0.3+1.3^2*0.1+2.3^2*0.1, or different from mean squared * probability and add, which is 0.289+0.196+0.027+0.169+0.529=1.21
Std is sqrt (V)=1.1
mean 1.7, variance 1.21, sd 1.1