Probability Unit Test
8 of 158 of 15 Items
Question
Suppose the probability of selecting a supermarket shopper who prefers plastic bags instead of paper bags is 50%. Out of 150 shoppers, how many can you expect will prefer plastic bags?(1 point)
Responses
50
50
100
100
70
70
75
The correct answer is 75.
Expected value = (Probability of selecting preference for plastic bags) x (Total number of shoppers)
Expected value = 0.5 x 150
Expected value = 75
Therefore, you can expect 75 shoppers out of 150 to prefer plastic bags.