Question 1132696
x*p(x)
0*.54=0
.34*25=$8.50
.12*60=$7.20
The expected value is this sum or $15.70  per passenger
For 120 passengers, the expected value is 120*$15.70 or $1884

the variance is -15.70^2*0.54=133.10
plus (25-15.70)^2*0.34=29.41
plus (60-15.70)^2*0.12=235.50
These add to 398.01 $^2
sqrt of this is the sd or $19.95