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?

a. 50
b. 100
c. 70
c. 75

Answer 1

To find the expected number of shoppers who prefer plastic bags, you can multiply the total number of shoppers by the probability of selecting a shopper who prefers plastic bags.

Given:
- Total shoppers = 150
- Probability of preferring plastic bags = 50% = 0.5

Expected number of shoppers preferring plastic bags = Total shoppers × Probability
= 150 × 0.5
= 75

So, the expected number of shoppers who prefer plastic bags is 75.

The correct answer is:
**d. 75**