Question

John runs a computer software store. Yesterday he counted 133 people who walked by the store, 62 of whom came into the store. Of the 62, only 29 bought something in the store

What is the probability that a person comes in AND buys something?

Answer 1

To figure the percentage you divide the number of people buying by the number of people that walk by. 29/133= 21.8% (approximately)

The more complicated way would be to figure out the percentage of people that enter the store first. 62/133 = 46.61% (approximately)

Then figure the percentage of people entering the store that buy something. 29/62 = 46.77% (approximately)

If you multiply the two percentages together, you will get the percentage of people that enter the store and buy something versus the number of people that walk by the store. .4661 * .4677 = 21.799% (approximately)

I use the word approximately because of rounding.