Question

24. Suppose there are five traffic lights that you need to pass while driving from your work to
school. The probabilities that you will stop for these red lights are: 0 red light with
probability 0.05, 1 red light with probability 0.45, 2 red lights with probability 0.30, 3 red
lights with probability 0.12, 4 red lights with probability 0.06, 5 red lights with probability
0.02. The probability that you stop for at least two red lights on a given day
(a) 0.20
(b) 0.30
(c) 0.50
(d) 1.00
25. A survey was conducted to learn about the shopping preference of consumers during
holiday season. Out of 2000 respondents 22% said they would prefer to shop online
because of the free shipping offered; 45% said that they would like to shop in malls and
discount outlets while 15% of the shoppers said they would use both. The probability
that a randomly selected shopper would use at least one method of shopping is
(a) 0.67
(b) 0.82
(c) 0.60
(d) 0.52