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A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service for the fleet of cars is bell-shaped and has a mean of 63 months and a standard deviation of 9 months. Using the 68-95-99.7 rule, what is the approximate percentage of cars that remain in service between 81 and 90 months?
Do not enter the percent symbol.
ans = %
An exhaustive survey of all users of a wilderness park taken in 1960 revealed that the average number of persons per party was 2.6.
A tollbooth operator has observed that cars arrive randomly at and average randomly at an average rate of 360 cars per hour. (Hint use a Poisson Distribution).
Find the probability that the first selected light bulb is good and the second light bulb is also good. (Show all work. Just the answer
Determine the probability that among 6 companies surveyed at random, number that provide employees 4 weeks of vacation after 15 years of employment.
Suggesting that the combined sample evidence tends to refute the hypothesis that the coin is fair. Explain this apparent discrepancy.
Please give step by step solution in detail. Determine if b is a linear combination of the vectors formed from the columns of the matrix A.
Define a relation x ≡ u iff for all n, x =n u. Show that this is an equivalence relation which has at most c different equivalence classes, and for any x, y, and u, if x ≡ u, then (x, y) ∈ C if and only if (u, y) ∈ C . For C = D and y = x , find a..
The DoD builds complex architectures for all major weapons systems and has significant experience in developing systems of systems.
Calculate a 95% confidence interval for the mean endowment of all the private colleges in the United States assuming a normal distribution for the endowments.
A battery manufacturer advertises the average life of its automobile battery is 60 months.what % of batteries should last between 50 and 70 months? The standard deviation is 10 months.
Estimate the true proportion of college students who believe in the possibility of haunted places with 99% confidence. According to Time magazine, 37% of americans believe that places can be haunted.
Dr. Moribus, a Kent University professor, wants to determine if his students are learning better. He obtains 50 final exam grade.
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