Question 1 of 20
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Question 2 of 20
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The length of a human pregnancy is normally distributed with a mean of 272 days with a
standard deviation of 9 days (Bhat & Kushtagi, 2006). How many days would a pregnancy last

Question 3 of 20
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Arm span is the physical measurement of the length of an individual's arms from fingertip to
fingertip. A man’s arm span is approximately normally distributed with mean of 70 inches with
a standard deviation of 4.5 inches. Find length in inches of the 99th percentile for a man’s arm

Part 2 of 6 - Continuous Random Variables and Probability Functions Questions
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Question 4 of 20
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Which type of distribution does the graph illustrate?

Part 3 of 6 - The Central Limit Theorem Questions
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Question 5 of 20
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Click to see additional instructions
The manufacturer of a new compact car claims the miles per gallon (mpg) for the gasoline
consumption is mound-shaped and symmetric with a mean of 24.6 mpg and a standard
deviation of 9.5 mpg. If 30 such cars are tested, what is the probability the average mpg
achieved by these 30 cars will be greater than 28?
Answer: Round your answer to 4 decimal places as necessary. For example, 0.1357 would
be a legitimate entry. Make sure you include the 0 before the decimal.

Part 4 of 6 - The Exponential Distribution Questions
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Question 6 of 20
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The commute time for people in a city has an exponential distribution with an average of 0.5
hours. What is the probability that a randomly selected person in this city will have a commute
time between 0.4 and 1 hours? Answer: (round to 3 decimal places)

Question 7 of 20
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