Question 1167136
mean is x*p(x)=0+0.19+0.64+0.51+0.44
=1.78
variance is sum of the squared deviations or
 1.78^2*0.21=0.665
0.78^2*0.19=0.116
0.22^2*0.32=0.015
1.22^2*0.17=0.253
2.22^2*0.11=0.542

the sum is 1.591

between 1 and 3 has probability of 0.68