Homework SourseiQ9 Suppose that in a population of shoppers the proportion
iQ9
Suppose that in a population of shoppers, the proportion of people who had visited supermarket A last month is 0.12. Also that in the same population, the proportion of people who had visited supermarket B last month is 0.64. The proportion of shoppers who had visited both supermarket A and supermarket B last month is 0.08.
What proportion of people in this population had visited supermarket A or supermarket B or both last month? (Give your answer to two decimal places.)
Solution
Suppose that in a population of shoppers, the proportion of people who had visited supermarket A last month is 0.12. Also that in the same population, the proportion of people who had visited supermarket B last month is 0.64. The proportion of shoppers who had visited both supermarket A and supermarket B last month is 0.08.
What proportion of people in this population had visited supermarket A or supermarket B or both last month? (Give your answer to two decimal places.)
P( A or B) = P(A) +P( B)-P( A and B)=0.12+0.64-0.08 =0.68
proportion of people in this population had visited supermarket A or supermarket B or both last month =0.68
