A company manufactures LED light bulbs. The lifetime for these bulbs is 4,100 hours with a standard deviation of 250 hrs. What lifetime should the company promote for these bulbs, so that only 2.0% of them burnout before the claimed lifetime?

Q: Suppose that a company makes light bulbs with a mean life of 310 hours, and a standard deviation of…

A: Given,  Mean μ = 310 Standard deviation σ = 47 Let x be hours a light bulb last

Q: A generator manufacturer found that the smallest, least expensive generator that they manufacture…

A: Given X is normal Distributed with mean µ = 2000.0 and standard deviation σ = 150.0

Q: The tread life of a certain brand of tires is known to be normally distributed with a mean of 40,000…

A: From the provided information, Mean (µ) = 40000 miles Standard deviation (σ) = 2000 miles X~N…

Q: A study finds that the carapace length of an adult spider is normally distributed with a mean of…

A:

Q: Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally…

A: Given data,Mean μ=1200sd    σ=50If n=30000P(1130<X<1260)=?

Q: Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally…

A: Given that the life expectancy of non defective light bulbs follows normally dist with mean 1200 hr…

Q: A company pays its employees an average wage of $22.50 an hour with a standard deviation of $2.30.…

A: Given data: Mean = $22.50 an hour standard deviation = $2.30 To find: What is the highest 5% of the…

Q: A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1025 h with a…

A:

Q: Suppose the average amount of apples per tree in a large orchard is 600 pounds with a standard…

A: Given, Population mean µx=600 pounds Population standard deviation σx=70 pounds a. Assuming that the…

Q: A manufacturer of light bulbs finds that one light bulb model has a mean life span of1025 h with a…

A:

Q: The speeds of all cars on the tollway was found to be normally distributed with a mean of 63 miles…

A: It is given that that µ=63 mile per hour. Obtain the standard deviation of the speeds of all cars:

Q: A certain company makes 12-volt car batteries. After many years of product testing, the company…

A: Normal distribution

Q: The life of a battery is normally distributed with mean 70 hours with a standard deviation of 10…

A: Given, μ = 70 σ = 10 Z = X-μσ

Q: it is claimed that personal vehicle is driven 24500 km per year. would you agree with this claim if…

A:

Q: A factory produces LED bulbs with an average lifespan of 50,000 hours and a standard deviation of…

A: The top 10% of bulbs last for at least how long is obtained below:From the given information, the…

Q: The length of a fully grown hibiscus plant is normally distributed and has a mean of 35cm. It is…

A:

Q: The time required for a person to complete the 2020 U.S. Census “long” form is normally distributed…

A: Let X be the census long form  X~N(μ=40, σ=10) P(X≥a) =10%  We want to find the value of a

Q: Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally…

A: From the given information, Consider, X be the random variable that shows number of non defective…

Q: the mean weight of a group of boys is 145 lb, with a standard deviation of 4lb. if the weights are…

A:

Q: the length of a certain species of fish were found to be normally distributed. the mean length is 72…

A: Any assumption about the parameter or probability function is called a hypothesis. Given data are…

Q: A population of 2 liter bottles of cola is known to have a mean fill-weight of 2.06 liters and a…

A:

Q: The average time it takes a certain brand of ibuprofen to start working is 25 minutes, with a…

A: Given Information :  The average time it takes a certain brand of ibuprofen to start working is 25…

Q: Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally…

A: mean, μ = 1200 hr Std. dev, σ =  150 hr n = 70000 x = 1395

Q: The mean life of a battery is 55 hours with a standard deviation of 6 hours. The manufacturer…

A:

Q: A particular battery claims to have a mean life of 400 hours with a standard deviation of 30 hours.…

A: Mu=400, sigma=30 P(X>420)= ?

Q: The monthly income from a particular occupation is normally distributed, with a mean of 3800 dollars…

A: Given,mean(μ)=3800standard deviation(σ)=500

Q: What is the standard deviation in respiration rate for the three fish?

A: From given data we have N=3 Water temperature (degrees C) Fish respiration rate (bpm) 14 76…

Q: The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 1500…

A:

Q: Out of a total of 10 college books estimate the standard deviation of their ages if the oldest…

A: Introduction: The minimum age of a textbook is 1.3 years. The maximum age of a textbook is 7.9…

Q: If a sample of 144 male weights has a mean of 266 pounds and standard deviation of 32 pounds. The CV…

A: Given data Mean (x̅ ) = 266Standard deviation (s) = 32Coefficient of variation(CV) for sample is…

Q: The diameter of a mason jar is 3 inches but can be as large as 3.05 inches and as small as 2.95…

A: From the question we'll find the value of Cpl. While we have given the UCL = 3.05 and LCL = 2.95…

Q: The weight of oranges growing in an orchard is normally distributed with a mean weight of 6 oz. and…

A: It is given that the mean is 6 and the standard deviation is 1.5.

Q: The numbers of books checked out daily at a local library are normally distributed with a mean of…

A:

Q: A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1,025 h with a…

A: Given: Mean: μ=1025 Standard deviation: σ=87 a. at least 950 h: Z=950-102587Z=-0.86…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 262 days…

A: Let X be the lengths of pregnancies in a small rural village x¯=262sd=16 X~ Normal (262, 162)   For…

Q: The life of a Radio Shack record player is normally distributed with a mean of 3.6 years and a…

A: Here, mean is 3.6 and standard deviation is 0.8.

Q: A telephone company has found that the lengths of its long distance telephone calls are normally…

A:

Q: A maths class has 100 members. If there is a 15% absentee rate per class meeting , find the standard…

A:

Q: A livestock company reports that the mean weight of a group of young steers is 1121 pounds with a…

A: From the provided information, Mean (µ) = 1121 pounds Standard deviation (σ) = 79 pounds Let X be a…

Q: One of the ways in which doctors try to determine how long a single dose of pain reliever will…

A: According to the given question, A report of the National Institutes of Health states that the…

Q: the mean weight of a group of boys is 145 lb, with a standard deviation of 5lb. if the weights are…

A: We have to find correct answer..

Q: Suppose Stock A has had a mean price of $6.58 per share with a standard deviation of $1.88, and…

A: GivenFor stock A:-Mean(μ)=6.58standard deviation(σ)=1.88For Stock B:-Mean(μ)=10.57standard…

Q: It is claimed that personal vehicle is driven 24500 km per year. Would you agree with this claim if…

A: Given data: Population mean = 24500 Sample size = 100 Sample mean = 28000 Sample standard deviation…

Q: Suppose there is a city where the mean cost per month of a one-bedroor apartment is $1,500, with a…

A: The percentage of one bedroom apartments in the city cost between $750 and $1000 is,

Q: The amount of time a certain brand of light bulb lasts is normally distributed with a mean of 1800…

A: X is normally distributed.  Mean = 1800 hours Sigma = 25 hours  X represents the amount of  time a…

Q: Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally​…

A: The probability that at least 1300 ​hr is,

Q: In a certain company, every worker received a $50-per-week raise. How does this affect the mean…

A: In a certain company, every worker received a $50-per-week raise. The mean salary is the average of…

Q: Suppose that a company makes light bulbs with a mean life of 310 hours, and a standard deviation of…

A: (1) Obtain the Z-score of a light which lasts 293 hours.  The Z-score of a light which lasts 293…

Q: A researcher claims that the amounts of acetaminophen in a certain brand of cold tablets have a…

A: Hypothesis: Hypothesis is an assumption about the parameter of the population which will be made…