-99.7% - 95%-
68%-
Not everyone pays the same price for
the same model of a car. The figure
illustrates a normal distribution for the
prices paid for a particular model of a
new car. The mean is $18,000 and the
standard deviation is $2000.
Use the 68-95-99.7 Rule to find the
percentage of buyers who paid less than
$ 16,000.
Number of Car Buyers
12 14 16 18 26 22 24
Price of a Model of a New Car (Thousands)
The percentage of buyers who paid less than $16,000 is
%.

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?