QUESTION 1 A mechanical engineer conducted a time study of a particular assembly operation on the assembly line.
Ninety per cent of the workers on the assembly line have at least two years experience, while the rest are
still trainees. He randomly selected 50 workers on the assembly line using stratified random sampling. How
many trainees did he include in his sample?
a) 5
b) 10
c) 45
d) 90