Question

In: Statistics and Probability

The lifetimes (in miles) of a certain brand of automobile tires is a normally distributed random...

The lifetimes (in miles) of a certain brand of automobile tires is a normally distributed random variable, X, with a mean lifetime of µ = 40000 miles and standard deviation σ = 2000 miles. The manufacturer would like to offer a guarantee for free replacement of any tire that does not last a specified minimum number of miles. If the manufacturer desires to have a replacement policy that they will need to honor for only 1% of all tires they sell, what number of miles should be included in the following guarantee: “We will replace any tire free of charge if the lifetime of the tire is less than -----------------------------miles.” (That is, what is the largest value for a lifetime a tire can have and still be among the shortest 1% of all tires’ lifetimes?) Round to the nearest mile.

Solutions

Expert Solution


Related Solutions

Life Span of Tires: A certain brand of automobile tires has a mean life span of...
Life Span of Tires: A certain brand of automobile tires has a mean life span of 35,000 miles and a standard deviation or of 2,250 miles. (Assume a bell-shape distribution). The span of three randomly selected tires are 34,000 miles, 37,000 miles, and 31,000 miles. Find the z-scores that correspond to each life span. Would any of these tires be considered unusual? The life spans of three randomly selected tires are 30,500 miles, 37,250 miles, and 35,000 miles. Using the...
The lifetimes of a certain electronic component are known to be normally distributed with a mean...
The lifetimes of a certain electronic component are known to be normally distributed with a mean of 1,400 hours and a standard deviation of 600 hours. For a random sample of 25 components the probability is 0.6915 that the sample mean lifetime is less than how many hours? A)1345 B)1460 C)1804 D)1790
The lifetime of Brand A tires are distributed with mean 45,000 miles and standard deviation 4900...
The lifetime of Brand A tires are distributed with mean 45,000 miles and standard deviation 4900 miles, while Brand B tiees last for only 36,000 miles on the average(mean) with standard deviation of 2010 miles. Niccoles Brand A tires lasted 37,000 miles and Yvettes Brand B tires lasted 35,000 miles. Relatively speaking, within their own brands, which driver fot the better wear?
A) The amounts of nicotine in a certain brand of cigarette are normally distributed with a...
A) The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean of 0.941 g and a standard deviation of 0.319 g. The company that produces these cigarettes claims that it has now reduced the amount of nicotine. The supporting evidence consists of a sample of 30 cigarettes with a mean nicotine amount of 0.848 g. Assuming that the given mean and standard deviation have NOT changed, find the probability of randomly selecting 30 cigarettes...
You measure the lifetime of a random sample of 64 tires of a certain brand. The...
You measure the lifetime of a random sample of 64 tires of a certain brand. The sample mean is x = 56.7 months and the sample variance is 39.1 months squared. Suppose that the lifetimes for tires of this brand follow a normal distribution, with unknown mean µ and a population variance is 25 months squared. Construct a 99% confidence interval for µ, the average lifetime for the tires.
A tire company finds the lifespan for one brand of its tires is normally distributed with...
A tire company finds the lifespan for one brand of its tires is normally distributed with a mean of 48,400 miles and a standard deviation of 5000 miles. If the manufacturer is willing to replace no more than 10% of the tires, what should be the approximate number of miles for a warranty? What is the probability that a tire will last more than 52,000 miles?   What is the probability that a mean of 25 tires will last less than...
The weights of a certain brand of candies are normally distributed with a mean weight of...
The weights of a certain brand of candies are normally distributed with a mean weight of 0.8541 g and a standard deviation of 0.0517g. A sample of these candies came from a package containing 440 candies and the package label stated that the net weight is 375.6 ( If every package has 440 candies, the mean weight of the candies must exceed 374 / 440= 0.8536 g for the net contents to weigh at least 375.6 g)g.) a. If 1...
The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean...
The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean of 0.883 g and a standard deviation of 0.293 g. The company that produces these cigarettes claims that it has now reduced the amount of nicotine. In what range would you expect to find the middle 95% of amounts of nicotine in these cigarettes (assuming the mean has not changed)? Between and . If you were to draw samples of size 30 from this...
The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean...
The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean of 0.902 g and a standard deviation of 0.287 g. The company that produces these cigarettes claims that it has now reduced the amount of nicotine. The supporting evidence consists of a sample of 33 cigarettes with a mean nicotine amount of 0.832 g. Assuming that the given mean and standard deviation have NOT changed, find the probability of randomly seleting 33 cigarettes with...
The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean...
The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean of 0.946 g and a standard deviation of 0.326 g. The company that produces these cigarettes claims that it has now reduced the amount of nicotine. In what range would you expect to find the middle 98% of amounts of nicotine in these cigarettes (assuming the mean has not changed)? Between  and . If you were to draw samples of size 46 from this population,...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT