The life of Sunshine CD players is normally distributed with a mean of 4.1 years and...
The life of Sunshine CD players is normally distributed with a mean of 4.1 years and a standard deviation of 1.3 years. A CD player is guaranteed for three years. We are interested in the length of time a CD player lasts. Find the probability that a CD player will last between 2.8 and five years. Give the probability statement and the probability.
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The life of Sunshine CD players is normally distributed with a
mean of 4.1 years and...
The life of Sunshine CD players is normally distributed with a mean of 4.1 years and...
The life of Sunshine CD players is normally distributed with a mean of 4.1 years and a standard deviation of 1.3 years. A CD player is guaranteed for three years. We are interested in the length of time a CD player lasts. Find the probability that a CD player will last between 2.8 and eight years.
The life of a Radio Shack record player is normally distributed with a mean of 3...
The life of a Radio Shack record player is normally distributed with a mean of 3 years and a standard deviation of 0.7 years. Radio Shack guarantees its record players for 2 years. (a) Find the probability that a record player will last less than 2 years? % (b) Find the probability that a record player will last more than 4 years? %
The prices of CD players are normally distributed, with a standard deviation of $12. A random...
The prices of CD players are normally distributed, with a standard deviation of $12. A random sample of 16 CD player prices is drawn. A confidence interval for the mean price shows a $9.30 margin of error. What was the level of confidence?
A manufacturer knows that their items have a normally distributed lifespan, with a mean of 4.1 years, and standard deviation of 1.1 years.
A manufacturer knows that their items have a normally distributed lifespan, with a mean of 4.1 years, and standard deviation of 1.1 years. If you randomly purchase one item, what is the probability it will last longer than 3 years?
The length of life of the Whirlpool automatic washer is approximately normally distributed with a mean...
The length of life of the Whirlpool automatic washer is approximately normally distributed with a mean of 3.1 years and a standard deviation of 1.2 years. If this type of washer is guaranteed for one year, what fraction of original sales will require replacement?
The mean replacement time for a random sample of 12 cd players is 8.6 years with...
The mean replacement time for a random sample of 12 cd players is 8.6 years with a standard deviation of 3.5 years. Construct the 98% confidence interval for the population variance σ2. Assume the data are normally distributed.
3. The life expectancy of computer terminals is normally distributed with a mean of 5.2 years...
3. The life expectancy of computer terminals is normally distributed with a mean of 5.2 years and a standard deviation of 8 months (2/3 years). Please answer the following questions. (a) What is the probability that a randomly selected terminal will last more than 6 years? (b) What percentage of terminals will last between 3.5 and 5.5 years?
A certain type of refrigerator has a length of life that is approximately normally distributed with...
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?
The lifetime of a cellphone is normally distributed with a mean of 18 months and a...
The lifetime of a cellphone is normally distributed with a mean of 18 months and a standard deviation of 2.8 months. What is the probability a cell phone lasts less than 10.88 months?
1) A manufacturer knows that their items have a normally distributed length, with a mean of...
1) A manufacturer knows that their items have a normally distributed length, with a mean of 11.9 inches, and standard deviation of 1.4 inches. If 15 items are chosen at random, what is the probability that their mean length is less than 12.4 inches? 2) A manufacturer knows that their items have a normally distributed lifespan, with a mean of 4.2 years, and standard deviation of 0.8 years. If you randomly purchase 2 items, what is the probability that their...
The lifetime of a cellphone is normally distributed with a mean of 18 months and a standard deviation of 2.8 months. What is the probability a cell phone lasts less than 10.88 months?
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