Question

John runs a computer software store. Yesterday he counted 125 people who walked by the store, 66 of whom came into the store. Of the 66, only 21 bought something in the store. (Round your answers to two decimal places.)
(a) Estimate the probability that a person who walks by the store will enter the store.


(b) Estimate the probability that a person who walks into the store will buy something.



(d) Estimate the probability that a person who comes into the store will buy nothing.

Answer 1

A. Divide number of people in the shop by total people walking by:

66/125 = 0.528 = 0.53

B. Divide people who bought something by total people walking by:

21/125 = 0.168 = 0.17

d. 66 -21 = 45 people don’t buy anything.

45/66 = 0.68