5. Assume a certain tire manufacturer produces a new tire. Tests show that the number of miles these tireslast before blow-out has a normal distribution with mean 60,000 miles and standard deviation 4000 miles.(a) Should they warrant their tires for 60,000 miles? Why or why not?(b) If they warrant their tires for 52,000 miles, what percentage of the tires would they expect to blow outwhile still under warranty?(c) If they warrant their tires for 50,000 miles, what percentage of the tires would they expect to blow outwhile still under warranty?

Answered: Image /qna-images/answer/086d5647-db31-4fcc-ad2b-346df0c5debc.jpg

Answered: 5. Assume a certain tire manufacturer…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Cuo (a) The Takoradi Tire and Rubber Company wishes to set a minimum mileage guarantee on its new MX100 tyre. Tests reveal the mean mileage is 67,900 with a standard deviation of 2,050 miles and that the distribution of miles follows the normal distribution. They want to set the minimum guaranteed mileage so that no more than 4 percent of the tyres will have to be replaced. What minimum guaranteed mileage should the company announce? levement
I n recent years, a number of companies have been formed that offer competition to AT&T in long-distance calls. All advertise that their rates are lower than AT&T's, and as a result their bills will be lower. AT&T has responded by arguing that for the average consumer there will be no difference in billing. Suppose that a statistics practitioner working for AT&T determines that the mean and standard deviation of monthly long-distance bills for all its residential customers are $17.09 and $3.87, respectively. He then takes a random sample of 100 customers and recalculates their last month's bill using the rates quoted by a leading competitor. Sample mean given 17.55.
A producer of televisions claims that his product will last at least 10 years on average. A sample of 40 is taken and the mean and standard deviation are found. The test statistic is calculated to be 1.756. Using a 5% level, the conclusion would be a. there is insufficient evidence for the producer’s claim to be considered correct b. there is sufficient evidence for the producer’s claim to be considered incorrect c. None of the above d. there is sufficient evidence for the producer’s claim to be considered correct
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2. The Kamp family has twins, Rob and Rachel. Both Rob and Rachel graduated from college 2 years ago, and each is now earning $50,000 per year. Rachel works in the retail industry, where the mean salary for executives with less than 5 years' experience is $35,000 with salary for engineers with less than 5 years' experience is $60,000 with a standard deviation of $5,000. Compute the z values for both Rob and Rachel and comment on your findings. a standard deviation of $8,000. Rob is an engineer. The mean
The shape of the distribution of the time required to get an oil change at a 15-minute oil-change facility is unknown. However, records indicate that the mean time is 16.2 minutes, and the standard deviation is 4.9 minutes. Complete parts (a) through (c). (c) Suppose the manager agrees to pay each employee a $50 bonus if they meet a certain goal. On a typical Saturday, the oil-change facility will perform 35 oil changes between 10 A.M. and 12 P.M. Treating this as a random sample, there would be a 10% chance of the mean oil-change time being at or below what value? This will be the goal established by the manager. There is a 10% chance of being at or below a mean oil-change time of _______ minutes? (Round to one decimal place as needed.)
I'm having difficulty labeling for the 3 boxes above the graph
I attached.
"A fitness coach woud like to determine whether her aerobic fitness intervention leads to a significant increase or decrease in the one rep max (i.e., heaviest possible weight that can be lifted once) for deadlifts in her group of athletes (n = 13). She finds that the mean difference = 3 lbs, with a sum of squared deviation (SS) = 84. Calculate the t-statistic the fitness coach would observe given this data. (Be sure to round your answer to the second decimal place)."
The reading speed of second grade students in a large city is approximately normal, with a mean of 91words per minute (wpm) and a standard deviation of 10 wpm. Complete parts (a) through (f).
A scientist has just been funded by the National Institutes of Health to conduct a very expensive study. As it happens, the budget has been cut. Therefore, the choice of laboratory for analysis of sample data is being re-visited. Suppose the choice is between laboratory “A” and “B”. Laboratory “A” has a standard deviation of one milligram and each sample analysis costs $3. Laboratory “B” has a standard deviation of two milligrams but each sample analysis costs $1. All other things being equal, is the principal investigator better off spending $9 on laboratory “A” or spending $9 on laboratory “B”?
The items have a standard cost of $81/unit. The monthly demand for items is normally distributed with a mean of 220 and a standard deviation of 40. The annual holding rate is 23% and the ordering cost is $200/order. it takes 3 weeks to receive the ordered items from the supplier. (4 weeks in a month, 12 months in a year, 48 weeks per year) You have been ordering a quantity of 237 units every time the inventory level fall under 195 units. What is the average cycle stock considering your policy?

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