During tim horton's "Roll up to win" promotion, customers who purchased a cup of coffee checked under the rim of the cup to see if they have won a prize. Among all cups, 16.7% were winners. If you bought one cup of coffee every day for a week (7days), what is the probability you win zero times?

0.2783

0.2983

0.2883

0.2683

0.2583

a gas station sells two grades of gasoline -- premium and regular. It is known that 30% of customers purchase premium gasoline. In a random sample of 13 customers, what is the probability that 2 or fewer of them purchase premium gasoline?

0.1925

0.2025

0.2125

0.1825

0.2225

A student must pass through two sets of traffic lights on his way to work. The first light is red 50% of the time, yellow 5% of the time and green 45% of the time. The second light is red 70% of the time, yellow 10% of the time and green 20% of the time. Assuming that the lights operate independently, what is the probability that the student has to stop exactly one time on his way to work? (assume that he will stop only for red light, and not if it yellow

0.47

0.49

0.50

0.46

0.48