A ball was drawn from a bag, its colour noted and the ball replaced each time. The draw was repeated 40 times and a red ball was obtained 10 times. What is the empirical probability of drawing a red ball, and how should this event be classified?
a) P=0.25, Impossible event
b) P=0.75, Possible event
c) P=0.25, Possible event
d) P=0.40, Possible event