A certain type of refrigerator has a length of life that is approximately normally distributed with a mean of 4.8 years and a population standard deviation of 1.3 years. What period of time should the manufacturer give as a guarantee if it is willing to replace only 1% of the machines?
A certain type of refrigerator has a length of life that is approximately normally distributed with...
The average life of a certain type of small motor is 10 years with a standard deviation of 2 years. The manufacturer replaces free all motors that fail while under guarantee. If she is willing to replace 3% of the motors that fail, how long a guarantee (in years) should she offer? You may assume that the lives of the batteries are normally distributed. A properly labeled figure of the normal distribution curve and x and z values is required...
A mechanic sells a brand of automobile tire that has a life expectancy that is normally distributed, with a mean life of 30,000 miles and a standard deviation of 2800 miles. He wants to give a guarantee for free replacement of tires that don't wear well. How should he word his guarantee if he is willing to replace approximately 10% of the tires?
The average life of a certain type of small motor is 10 years with a standard deviation of 2 years. The manufacturer replaces free all motors that fail while under guarantee. If she is willing to replace only 3% of the motors that fail, how long a guarantee should be offered? Assume that the lifetime of a motor follows a normal distribution.
A company produces refrigerator motors. These engines have a life expectancy of 19.4 years with a standard deviation of 4.8 years. Assume that the service life of the motors is normally distributed. In order to promote the sale of its engines, the company wants to go out with a guarantee on the engines which assumes that the customer can replace the engine free of charge if it breaks before a certain time. b) How many years of warranty can the...
7. The life of a Freeze Breeze electric fan is normally distributed with a mean 4 years and standard deviation 1.2 years. The manufacturer will replace any defective fan free of charge while it is under guarantee. For how many years should a Freeze Breeze fan be guaranteed if the manufacturer does not want to replace more than 5% of them?
A mechanic sells a brand of automobile tire that has a life expectancy that is normally distributed, with a mean life of 29 comma 000 miles and a standard deviation of 2800 miles. He wants to give a guarantee for free replacement of tires that don't wear well. How should he word his guarantee if he is willing to replace approximately 10% of the tires? Tires that wear out by [ ] miles will be replaced free of charge. (Round...
If the lifetime X of a certain kind of automobile battery is normally distributed with mean of 3 years and standard deviation of 1 year, and the manufacturer wishes to guarantee the battery for 2 years, what percentage of the batteries will he have to replace under the guarantee? 5.
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...
23. A mechanic sells a brand of automobile tire that has a life expectancy that is normally distributed, with a mean life of 35,000 miles and a standard deviation of 2800 miles. He wants to give a guarantee for free replacement of tires that don't wear well. How should he word his guarantee if he is willing to replace approximately 10% of the tires?
The average life of a certain type of small engine is 10 years, with a standard deviation of 2 years. The manufacturer replaces for free all motors that fail within the warranty period. If you were willing to replace only 3% of failed engines, how long a warranty should you offer? Suppose that the duration of an engine follows a normal distribution. Answer with 4 decimals.