Math10Exam2Spring2011

Math10Exam2Spring2011 - Math 10 Spring 2011 FORM R Exam 2...

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Questions 4 - 5 refer to the following: The speed of cars traveling on a stretch of Interstate 5 in California is approximately normally distributed with a mean of 72.6 miles/hour and a standard deviation of 4.78 miles/hour. The legal speed limit posted on this stretch of Interstate 5 is 70 miles/hour. 4. Approximately what percentage of the cars travel above the speed limit? A 3.7% B. 2.6% C. 70.7% D. 72.6% 5. 60% of all cars on this stretch of Interstate 5 are going at most how fast? A. 73.8 miles/hour B. 71.4 miles/hour C. 68.8 miles/hour D. 71.2 miles/hour Questions 6 – 8 refer to the following: The Public Policy Institute of California estimates that 34% of workers in California have a Bachelor’s Degree. Suppose 18 workers in California are randomly selected. Let the random variable X = the number of workers out of one sample of 18 that have a Bachelor’s Degree. 6. What is the distribution of X? A. X ~ N(6.12, 2.01) B. X ~ N(6.12, 4.04) C. X ~ B(18, 0.34) D. X ~ Exp(0.34) 7. In repeated surveys of 18 workers, on average how many do we expect to have a Bachelor’s Degree? A. 7.01
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Math10Exam2Spring2011 - Math 10 Spring 2011 FORM R Exam 2...

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