**8. Correct. The answer is
false. **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%.