18. Company XYZ know that replacement times for the portable MP3 players it produces are normally distributed with a mean of 3.2 years and a standard deviation of 0.4 years. Find the probability that a randomly selected portable MP3 player will have a replacement time less than 2 years? Report your answer accurate to 4 decimal places

Q: find the probability that the one-year return of the stock will be positive

A: Suppose that the annual rate of return for a common bio technology stock is normally distributed…

Q: 5 -2020 the mean annual gain of the Dow Jones was 651.  A random sample of 33 years is selected from…

A: AnswerGiven,The population mean = 651The sample size [n] = 33The standard deviation = 1541

Q: Allstar Battery Company’s best battery has been shown to have a lifetime that is normally…

A:

Q: Suppose the mean income of firms in the industry for a year is 100 million dollars with a standard…

A: Given,mean(μ)=100Standard deviation(σ)=15

Q: Suppose that replacement times for washing machines are normally distributed with a mean of μ= 8.7…

A: Let ,  random variable X be the replacement times for washing machines  The random variable X…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7 years,…

A: According to the given information, we have The distribution is normal. Mean = 7 years and Standard…

Q: Suppose that the amount of time that students spend studying in the library in one sitting is…

A: We have given that a random variable X i.e, the amount of time is normally distributed with mean 45…

Q: The life time of a particular steel plate used in constructions has a normal distribution with a…

A: we have given that, the construction normally distributed with mean (mu)= 80 and standard deviation…

Q: For a standardized psychology examination intended for psychology majors, the historical data show…

A: From the provided information, Mean (µ) = 505 Standard deviation (σ) = 180 Let X be a random…

Q: If a drug is distributed with a mean duration of 240 minutes and a standard deviation of 40 minutes…

A: If a drug is distributed with a mean duration of 240 minutes and a standard deviation of 40 minutes…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 3.9…

A: Refer Standard normal table/Z-table, Lookup for z-score corresponding to area 0.08 to the left of…

Q: In a study of the life expectancy of 500 people in a certain geographic region, the mean age at…

A: The mean is 72.0 and the standard deviation is 5.3.

Q: Normal distribution can be used to model many sets of measurements in nature, industry, and…

A: Given: The normal distribution includes the many set model of measurements that is included in the…

Q: Find the probability that the mean of this sample will be more than 130 between 120 and 125 between…

A: It is given that: Population Mean =μ= 120    Standard deviation = σ=18   Sample size =n= 64  Sample…

Q: A particular fruit's weights are normally distributed, with a mean of 798 grams and a standard…

A: According to the given information, we have Given that a particular fruit's weight are normally…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 14.6…

A: Determine the number of years that will be less than if 15 items are picked at random, 4% of the…

Q: Suppose that the lifetimes of a certain kind of light bulb are normally distributed with a standard…

A: Given,standard deviation(σ)=100

Q: The temperature distribution of city C has a population mean u = 11.17. You randomly select 28 days…

A:

Q: A particular fruit's weights are normally distributed, with a mean of 522 grams and a standard…

A: GivenMean(μ)=522standard deviation(σ)=32sample size(n)=20

Q: The average amount of time spent waiting in line at the grocery store is normally distributed with a…

A:

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

A: From the provided information,Mean (µ) = 1400Standard deviation (σ) = 100X~N (1400, 100)90,000 of…

Q: The historical annual average return on long-term government bonds is 5.8% and its standard…

A: Given data, Mean μ=5.8%=0.058sd    σ=9.3%=0.093P(X<-3.5%)=?=P(X<-0.035)=?

Q: Suppose that the lifetimes of a certain kind of light bulb are normally distributed with a standard…

A: We have to find population mean.

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.4…

A:

Q: Suppose that replacement time for washing machines are normally distributed with  mean 9.3 years and…

A:

Q: Suppose cattle in a large herd have a mean weight of 1228lbs and a variance of 8100. What is the…

A:

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 13.8…

A:

Q: hours. If exactly 98% of the bulbs die before 925 hours, find the mean lifet

A: The z score is calculated as: z=x-μσ The value of z at 98% is 2.05. (from z table).

Q: Suppose that the lifetimes of a certain kind of light bulb are normally distributed with a standard…

A:

Q: Suppose that the lifetimes of a certain kind of light bulb are normally distributed with a standard…

A: Given information Lifetimes of a light bulb is normally distributed with a standard deviation of 120…

Q: Suppose that the lifetimes of TV tubes are normally distributed with a standard deviation of 1.2…

A: Let, X be the lifetimes of TV tubes. X~Nμ,σ2 where, μ=the mean lifetime of TV tubes which is unknown…

Q: uppose that the lifetimes of a certain kind of light bulb are normally distributed with a standard…

A: Given that   Certain kind of light bulb are normally distributed. Standard deviation (σ) = 100 90%…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 3.1…

A: Let us denote X=lifespan  Given that X follows a normal distribution with mean=3.1 and standard…

Q: A psychologist obtains a random sample of 20 mothers in the first trimester of their pregnancy. The…

A:

Q: Suppose the mean income of firms in the industry for a year is 30 million dollars with a standard…

A:

Q: Suppose that the lifetimes of a certain kind of light bulb are normally distributed with a standard…

A: For a defined random variable X, with the assumption, X~N(μ,σ2), the z-score is Z=X-μσ…

Q: Suppose the number of items you can deliver in a day is a random variable with some unknown…

A: According to the given information, we have Mean = 35 Standard deviation = 8 Sample size = 36

Q: A study shows that the intelligence quotient (IQ) of adults in a country follows a normal…

A:

Q: Suppose the mean income of firms in the industry for a year is 100 million dollars with a standard…

A:

Q: Suppose that the lifetimes of old-fashioned TV tubes are normally distributed with a standard…

A:

Q: Suppose the mean income of firms in the industry for a year is 25 million dollars with a standard…

A: Suppose the random variable x defines the income of firms in the industry.

Q: Assume that adults have IQ scores that are normally distributed with a mean of mμ=100 and a standard…

A: