Question 1041094
Let the random variable X = # of engines in working condition.

The possible values of X: 0, 1, 2, 3, 4.

==> {{{P(X >= 2) = (matrix(2,1,4,2))*0.08^2*0.92^2 + (matrix(2,1,4,3))*0.08^1*0.92^3 + (matrix(2,1,4,4))*0.08^0*0.92^4 = 0.99807488}}},

the probability that the aircraft will land safely.