Trevor is interested in in purchasing the local hardware/sporting goods store in the small town of dove creek, montana. after examining accounting records for the past several years , he found the store has been grossing over $850 per day about 70% of the business day it is open. estimate the probability that the store will gross over $850a) at least 3 out of 5 business daysb) at least 6 out of 10 business daysc) fewer than 5 out of 10 business days