Exam 1a Spring 06 KEY

# Exam 1a Spring 06 KEY - ECON 2843 010 Exam 1 Spring 2006...

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ECON 2843 – 010 Name KEY Exam 1 ID # Spring 2006 Lab Instructor Form A Lab Meeting Time Students must show all work on problems that involve calculation. Questions 1 through 4 refer to the following. Gas mileages for cars owned by a corporation are surveyed. The relative frequency distribution by miles per gallon (MPG) for the 20 cars in this population is shown in the table below. relative MPG frequency 6 up to 12 .10 12 up to 18 .25 18 up to 24 .45 24 up to 30 .20 1. What is the median class? 5 a. 6 up to 12 b. 12 up to 18 c. 18 up to 24 * d. 24 up to 30 2. Calculate the mean gas mileage in MPG for these cars. (Hint: As a check figure, the answer is equal to the tetrahedral constant, t.) 19.5 3. What is the cumulative frequency of the class 12 up to 18? 7 4. Calculate the standard deviation. a. 5.3245 * b. 5.4628 c. 28.35 1

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d. 29.8241 5. Suppose P(A) = .60 and P(B) = .50. Is it possible for P(A | B), i.e., the conditional probability of A given B, to equal the probability that both A and B occur? a.
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Exam 1a Spring 06 KEY - ECON 2843 010 Exam 1 Spring 2006...

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