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Stat Assignment
1. Toby's Trucking Company determined that on an annual basis, the distance traveled per truck is normally distributed, with a mean of 50,000 miles and a standard deviation of 12,000 miles.
a. What proportion of trucks can be expected to travel between 38,000 and 62,000 miles in the year?
b. What percentage of the trucks travel less than 35,000 miles in the year?
c. What percentage of the trucks travel more than 57,000 miles in the year?
d. How many miles will be traveled by at least (equal to and more than) 72% of the trucks?
Your Answers:
A. _____________ B. _____________ C. _____________ D. ________
1. Warranty records show that the probability that a new car needs a warranty repair in the first 90 days is 0.05. If a sample of 3 new cars is selected:
A. What is the probability that none needs a warranty repair? __________________
B. What is the probability that at least one needs a warranty repair? _________________
C. What is the probability that more than one needs a warranty repair? __________________
The key components of this problem are: Sample size (trials) = 3 new cars Probability of “success” = 5% Number of “successes”:
A: Exactly 0 B: 1 or more C: More than one
2. Please find an example online (unique example) of a statistical presentation and critique it. Specifically, what is it telling you? Is it possible the data is being represented in a way to make you think in a certain direction? If so, how? If not, what areas in the presentation could be improved upon? Write a brief report (2-3 paragraphs) as if you were a consultant.
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