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The lifetime of a certain brand of tires is normally distributed. The average lifetime of a...
The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed...
The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed with a mean of 32 and a standard deviation of 4. Round to the second. a) Find the 50 percentile of tire lifetimes. b) Find the tire life that has 70% above it. c) Find the two tire lives that hold the middle 15% Lower Upper d) The tire company wants to guarantee that its tires will last a certain number of miles. What...
The lifetime of a certain brand of tires is approximately normally distributed, with a mean of...
The lifetime of a certain brand of tires is approximately normally distributed, with a mean of 45,000 miles and a standard deviation of 2,500 miles. The tires carry a warranty for 40,000 miles.(Show work please) What proportion of the tires will fail before the warranty period? What proportion of the tires will fail after the warranty expires, but before they have lasted for 41,000 miles? Suppose a sample of 100 randomly selected tires are tested, what is the probability that...
2.A tire manufacturer claims that the lifetime of its tires are normally distributed with a mean...
2.A tire manufacturer claims that the lifetime of its tires are normally distributed with a mean of m = 34,000 miles and a standard deviation of σ = 1200 miles. A trucking firm using these tires suspects that the mean lifetime is less than 34,000 miles. To test the claim, the firm randomly selects and tests 54 of these tires and gets a mean lifetime of 33,390 miles. Use a significance level of a = 0.05 to test the trucking...
The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed...
The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed with mean =μ39 and standard deviation =σ5. (a) What is the probability that a randomly chosen tire has a lifetime greater than 47 thousand miles? (b) What proportion of tires have lifetimes between 38 and 43 thousand miles? (c) What proportion of tires have lifetimes less than 44 thousand miles? Round the answers to at least four decimal places.
The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed...
The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed with mean = 41 and standard deviation = 4. Use the TI-84 Plus calculator to answer the following. (a) Find the 21st percentile of the tire lifetimes. (b) Find the 73rd percentile of the tire lifetimes. (c) Find the first quartile of the tire lifetimes. (d) The tire company wants to guarantee that its tires will last at least a certain number of miles....
A manufacturer produces tires. The lifetime of the tires is normally distributed with a mean of...
A manufacturer produces tires. The lifetime of the tires is normally distributed with a mean of 25,000 miles and a standard deviation of 2,000 miles. What percent of the tires can be expected to last between 25,000 miles and 28,500 miles?
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 5,000 miles. Find the probability of a tire lasting more than 57,000 miles.
The average bill for car repairs at a car service center is $196, with a standard...
The average bill for car repairs at a car service center is $196, with a standard deviation of $44. Assuming the bills to be normally distributed, find the probability of a bill exceeding $300. Group of answer choices 0.4909 0.0182 0.9819 0.1406 0.0090 A tire manufacturer believes its tires will last an average of 48,000 miles, with standard deviation of 2,000 miles. What is the probability that one of these tires, chosen at random, will last at least 50,000 miles?...
Suppose that the lifetimes of tires of a certain brand are normally distributed with a mean...
Suppose that the lifetimes of tires of a certain brand are normally distributed with a mean of 74,000 miles and a standard deviation of o miles. These tires come with a 55,000-mile warranty. The manufacturer of the tires can adjust o during the production process, but the adjustment of o is quite costly. The manufacturer wants to set o once and for all so that only 1% of the tires will fail before warranty expires. Find the standard deviation to...
Problem 7: [5 points) The lifetime of a certain type of battery is normally distributed with...
Problem 7: [5 points) The lifetime of a certain type of battery is normally distributed with a mean value of 10 hours and a standard deviation of 1 hour. There are 4 batteries in a package. Question: What lifetime value is such that the total lifetime of all batteries in a package say, X1 + X2 + X3 + X4, exceeds that value for only 2% of all packages?
The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed with a mean of 32 and a standard deviation of 4. Round to the second. a) Find the 50 percentile of tire lifetimes. b) Find the tire life that has 70% above it. c) Find the two tire lives that hold the middle 15% Lower Upper d) The tire company wants to guarantee that its tires will last a certain number of miles. What...
Suppose that the lifetimes of tires of a certain brand are normally distributed with a mean of 74,000 miles and a standard deviation of o miles. These tires come with a 55,000-mile warranty. The manufacturer of the tires can adjust o during the production process, but the adjustment of o is quite costly. The manufacturer wants to set o once and for all so that only 1% of the tires will fail before warranty expires. Find the standard deviation to...
Problem 7: [5 points) The lifetime of a certain type of battery is normally distributed with a mean value of 10 hours and a standard deviation of 1 hour. There are 4 batteries in a package. Question: What lifetime value is such that the total lifetime of all batteries in a package say, X1 + X2 + X3 + X4, exceeds that value for only 2% of all packages?
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