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The empirical rule Use The empirical rule. ( 68 - 95 - 99.7 ) The interest rate for the financing of a used car is on aucrage 91. with a standard deviation of 3. Assuming that the interest rates for used car loans are normally distributed, approximately what porcentage of loans have an interest rate between 61 . and 12 - 1 - 2 C 2 ) Determine the probability A a Certain college , there are 600 freshmens, 400 Sophmores, 300 Juniors, and 200 Seniors. if one student is selected what is the probability that the student is a sophomore? 3 A hotel Find the probability A hotel has 20 rooms on the first floor, 60 rooms and the second floor, uo rooms on the third floor , and 20 rooms on the fourth floor if a hotel room is assigned at a random what is the probability of getting a room on an odd floor