Question

John runs a computer software store. Yesterday he counted 133 people who walked by the store, 66 of whom came into the store. Of the 66, only 25 bought something in the store. (Rounding 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.

c.) Estimate the probability that a person who walks by the store will come in and buy something

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

Answer 1

133 people who walked by the store, 66 of whom came into the store

Of the 66, only 25 bought something in the store

a)

probability that a person who walks by the store will enter the store = 66/133 = 0.50

b)

probability that a person who walks into the store will buy something = 25/66 = 0.38

c)

probability that a person who walks by the store will come in and buy something= 25/133 = 0.19

d)

probability that a person who comes into the store will buy nothing = 1 - probability that a person who walks into the store will buy something = 1-0.38 = 0.62