The probability is 0.7 that a person shopping at a December 28, 2016 By Essaypros The probability is 0.7 that a person shopping at a certain store will spend less than $20. For groups o size 21, find the expected number of shoppers who spend less than $20. We Deliver Top Quality On Time As Promised! Ready to get started? Just click the button to be directed to a secure page so you can enter the details of your paper.