A manufacturer of light bulbs finds that one light bulb model has a mean life span of1025 h with a standard deviation of 87 h. What percent of these light bulbs will last at least 950 h?

Q: a manufacturer claims that the mean lifetime of its fluorescent bulbs is 1050 hours. a homeowner…

A: Given n=40 Standard deviation =80 Xbar=1030 Level of significance=0.05 Mu0=1050

Q: The weight of oranges growing in an orchard is normally distributed with a mean weight of 8 oz. and…

A: Given that, μ=8 ozσ=1 Then, P7<x<9 Then, by the empirical rule solve as,…

Q: In measuring ignition duration, an engineer estimates that the standard deviation is 0.05 seconds.…

A: We have given that  Standard deviation = 0.05  Margin of error =E=0.01 95% confidence interval.

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: A sample of 3000 persons were surveyed for their weight in pounds, the mean weight is 135 Ibs with a…

A:

Q: Q5. Television from a company are found to last on average for three years without any hardware…

A:

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

A:

Q: Books in the library are found to have average length of 350 pages with standard deviation of 100…

A: Given: μ=350σ=100x=80

Q: A biologist is interested in studying the effect of vitamin supplements on deer mouse body length.…

A: Note: According to Bartleby, expert solve only one question and rest can be reposted.

Q: A livestock company reports that the mean weight of a group of young steers is 1154 pounds with a…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

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: The lifetime of a 2-volt non-rechargeable battery in constant use has a Normal distribution, with a…

A: Given: μ=516σ=20 The proportion of batteries with lifetimes exceeding 520 hours is obtained as…

Q: Data collected by the highway patrol indicates that the average speed on a stretch of interstate is…

A:

Q: In an agricultural study, the average amount of corn yield is normally distributed with a mean of…

A: Given :- In an agricultural study, the average amount of corn yield is normally distributed with a…

Q: The weights of adult California Condors average 14.8lbs with a standard deviation of 3.25lbs.…

A:

Q: A researcher claims that the standard deviation of the number of deaths annually from typhoons in…

A:

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 gestation period for human births can be taken as normally distributed with a mean of 266 days…

A: Given:

Q: The length of time it takes a Grade 11 student to play the Candy Crush computer app follows a normal…

A: Given that  The length of time it takes a grade 11student to play the candy crush computer is…

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: Light bulbs, having a mean life of 2400 hours and standard deviation of 63 hours, are used for…

A: Given: Mean(μ)=2400standard deviation(σ)=63sample size (n)=4000

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: A candy store sells about 8 million pieces of candy per day with a standard deviation of 300,000…

A: Given : Let X : Number candy that they sell in a given day           μ = 8 million i.e   Mean (μ) =…

Q: Television from a company are found to last on average for three years without any hardware…

A: From the given information,  Consider, X is the life of television and assuming it follows normal…

Q: The Virginia Cooperative Extension reports that the mean weight of yearling Angus steers is 1152…

A: a) Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

Q: During 1 week, an overnight delivery company found that the weights of its parcels were normally…

A: A normal distribution is called a standard distribution if; 1. 68% of the values of the random…

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

A: (a)Given:

Q: The fuel efficiency of cars currently registered in the Commonwealth of Virginia is normally…

A: X follows a Normal distribution with mean = 24 and S.D = 6 Then z=(x-mean)/SD = (x-24)/6  follows…

Q: The lifetime of a 2-volt non-rechargeable battery in constant use has a Normal distribution, with a…

A: Let us consider, The lifetime of a 2-volt non-rechargeable battery is denoted by X. Then…

Q: The lifetime of a light bulb is normally distributed with an average life of 500 hours and a…

A: Define the Random Variable, X : Life time of a light bulb. Given that , X ~ N(500,1002 )  So, Z =  X…

Q: A livestock company reports that the mean weight of a group of young steers is 1150 pounds with a…

A: μ=1150σ=87  =P1050<x<1250

Q: A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1022 h with a…

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: Suppose that a certain brand of water filter has a mean life of 600 gallons and a standard deviation…

A: Mean = 600 Standard deviation = 53

Q: The mean life of a battery is 50 hours with a standard deviation of 6 hours. The manufacturer…

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 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: The life of a semiconductor laser at a constant power is normally distributed with a mean of 7,994…

A: X=Life of semiconductor laser at a constant power Mean μ=7994 hours Standard deviation σ=594 hours…

Q: A manufacturer of calculator batrries claims that the mean length of life for its battry is 500…

A:

Q: A livestock company reports that the mean weight of a group of young steers is 1180 pounds with a…

A: GivenMean(μ)=1180standard deviation(σ)=90

Q: The length of a human pregnancies is approximately normal distributed with mean m equals to 266 days…

A: Use the excel formula to find the indicated critical value as follows:

Q: Books in the library are found to have an average length of 350 pages with a standard deviation of…

A: Given that, Books in the library are found to have an average length of 350 pages with a standard…

Q: Suppose a company produces lightbulbs with a mean lifetime of 1000 hours and a standard deviation of…

A: The z-score formula is, z=x-μσ In the formula, x be the random variable, μ be the population mean,…

Q: An analyst found that the average amount of money in bank accounts at his/her bank is $2,000 with a…

A:

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: An air condition company will spend an average of 64 minutes with a standard deviation of 19 minutes…

A:

Q: A researcher claims that 20 years old women on a special diet will have an average weight of 110…

A: Given : 20-year old women :  average weight =110 pound Sample of 15 women : average weight =112.5…

Q: The speeds of motorists passing a particular point on a motorway are found to be normally…

A:

Q: A survey indicates that the customers of a local supermarket spend an average of 45 minutes shopping…

A: The customer of local supermarket spend an average of 45 minutes for shopping. The standard…