
4.20. Reconsider Example 4.8, supposing that the angles are random variables. The 30
◦
angle now is a
random variable with mean of 30
◦
and variance of 3
◦
and the 45
◦
angle now is a random variable with
mean of 45
◦
and variance of 4
◦
. The applied force has the same statistics as in the example. ...