Question3: Choose one answer. A small store keeps track of the number X of customers that make a purchase during the first hour that the store is open each day. Based on the records, X has the following probability distribution. X 0 1 2 3 4 Px(X) 0.1 0.1 0.2 0.3 0.3 The standard deviation of the number of customers that make a purchase during the first hour that the store is open is 1) 1.2806 2) 1.64 3) 1.5 Question4: Choose one answer. In a small town of 100 households, 29 own no dogs, 38 own one dog, 22 own two dogs, and 11 own three dogs. Two different households are picked at random. Let "x" = the total number of dogs these two households own. What is P(X 2 2)