Thirty percent of all customers who enter a store will make a purchase. suppose that six customers enter the store and that these customers make independent purchase decisions.

It was stated that only thirty percent of all customers who enter a store will make a purchase and it was not mentioned whether it is independent or dependent purchase decisions. Suppose, there six customers entered the store and since the thirty percent of this is 2 heads. Therefore, out of 6 customers, only 2 persons will purchase. 

Same length is comparing because it’s saying its the same and not different