**8. Incorrect. The answer is
false, not true. **The probability of
having a defective bulldozer is 0.1. The expected value of malfunctioning
machines in a group of ten units is 1. Let λ = 1. The requested
probability can be computed using the Poisson formula:

_{}

Therefore, P(X=2) = (1^{2}e^{-1})/2! =
0.1839 or 18.39%.