Suppose that the replacement times for washing machines are normally distributed with a mean of 8.8 years and a standard deviation of 1.2 years. What percentage of washing machines in a random sample of size 9 will be replaced in less than 10 years?? O 99.87% 84.13% 68% 50.13% O None of the other options

Q: If a population has a mean of 228.8 and a standard deviation of 35.5 then a sampling distribution…

A: Given that, mean is 228.8 and standard deviation is 35.5. We will use z-standard normal…

Q: About 11% of the total U.S. wheat crop is destroyed by jail. A random sample of 16 claims reported…

A: From the provided information, Sample size (n) = 16 Population mean (µ) = 11 Sample mean (x̅) = 13.2…

Q: P. Question 30 !! In the Excel file "Test3Data.xlsx", you are given 25 samples of ingots (gold bars)…

A: Note- Since you have posted multiple questions, as per our guidelines we are supposed to answer only…

Q: Student Contributed Question). Which curve in the figure below represents a Normal distribution with…

A: Given,a normal curves with various means and standard deviations.To find the curve which is normal…

Q: What is the test statistic? (#1 – #2) – (41 – µ2) OF Ot ta (T1 – ã2) – (41 – µ2) (P1 – P2) – (P1 –…

A: In the given situation, the testing is based on two proportions. That is, there are two populations…

Q: concentration (µg/mL) of a specific dose of ampicillin in the urine after various periods of time.…

A: In question, Given that we want to estimate the concentration (µg/mL) of a specific dose of…

Q: A population has a mean of 80 and a standard deviation of 7. A sample of 49 observations will be…

A: Given Information: Mean μ=80 Standard deviation σ=7 Sample size n=49

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A:

Q: Assume the random variable X is normally distributed, with mean u=57 and standard deviation o = 7.…

A: The random variable  X is normally distributed The population mean is 57. The population standard…

Q: Determine whether the given procedure results in a binomial distribution. If it is not​ binomial,…

A:

Q: Assume that a randomly selected subject is given a bone density test. Those test scores are normally…

A:

Q: A random sample of 10 subjects have weights with a standard deviation of 9.7246 kg. What is the…

A: We have given that  Sample size=n=10 Sample standard deviation=9.7246

Q: Suppose X is normally distributed with a mean of 43 and a standard deviation of 17. According to…

A: Given that  X is normally distributed with a mean of 43 and a standard deviation of 17

Q: An independent random sample is selected from an approximately normal population with an unknown…

A:

Q: The number of years of education of self-employed individuals in the United States has a population…

A: The sample size is 100 with a sample standard deviation of 0.6 years. That is, .

Q: In a certain state, two-fifths of all adults register as Democrats.  A random sample of 150 adults…

A: From the information, given thatLet the random variable X denotes the number of registered Democrats…

Q: A random sample of size 225 is drawn from a population with mean 100 and standard deviation of 20.…

A: If repeated samples of size n is drawn from the population and the mean of each sample is computed,…

Q: Suppose samples of size 100 are drawn randomly from a normal population that has a mean of 20 and a…

A: Solution: Let X be the random variable. From the given information, X follows normal distribution…

Q: How many retired people should be sampled if we want to calculate with 92% confidence the true mean…

A: The provided information are: Confidence level = 92% Margin of error (E) = 0.8 Population standard…

Q: What is the probability a​ male's growth plates fuse after age  21​?

A: The ability to determine the age of some individuals can be difficult if there are not quality…

Q: 5. A company claims that a vitamin supplement decreases the recovery time from a common cold. A…

A: The following information is given in the question n1=35x¯1=6.9s1=2.9n2=35x¯2=5.8s2=1.2 The…

Q: In a population, the variable Rain is normally distributed with a mean of 10 and a standard…

A:

Q: 36% of a population has a particular characteristic. If samples of size n=400 are taken, calculate…

A: Solution: From the given information, the probability of a particular characteristic is 0.36 and the…

Q: A simple random sample of 100 observations was taken from a large population. The sample mean and…

A: According to the given information in this question We need to find standard error

Q: One measure of value for stocks is the PIE or price-to-earnings ratio. High P/E ratios may indicate…

A: Suppose μ is the population mean P/E ratio of all socially conscious stocks.

Q: The scores on a test are normally distributed with a mean of 100 and a standard deviation of 20.…

A:

Q: If a normal population has a mean of 20 and a standard deviation of 4, what is the z-value…

A: Given info: If a normal population has a mean of 20 and a standard deviation of 4.

Q: For men heights are normally distributed with a mean of 69 inches and a standard deviation of 2.8…

A: The random variable X is heights of the men. It is normally distributed. X~N(μ=69,σ=2.8) The sample…

Q: If random samples, each with n = 16 scores, are selected from a normal population with µ = 100 and σ…

A: Here, the known values are n = 16 scores, µ = 100 and σ = 20.

Q: A population has a standard deviation of 18 on average how much difference should exist for a random…

A: A population has a standard deviation of 18.

Q: , 3.9, 5.7, 6.5, 5.9, 3.9, 7.4, 4.3, 5.9, 4.5, 4.2, 7, 5.1, 4 an be concluded at the the a = 0.05…

A: Answer Given,5.5,3.9,3.9,5.7,6.5,5.9,3.9,7.4,4.3,5.9,4.5,4.2,7,5.1,4.The sample size [n] = 15We…

Q: Afln a particular workshop it s found that about 85% of the production in 2020 are success. Find the…

A: Binomial distribution allows us to compute the probability of observing specified number of events…

Q: An oceanographer claims that the mean dive duration of a North Atlantic right whale is 11.6 minutes.…

A: The t-test statistic is appropriate method when the population standard deviation is unknown. Then,…

Q: A sample mean for a treated group of n = 9 individuals is 32 and the population mean for the…

A: It is assumed that μ is the population mean for the untreated group.

Q: Concrete factory produces ten types of concrete products shown in the table below. if all types of…

A: The coefficient of variation is the percentage of the coefficient of standard deviation. The…

Q: Gestation Periods of Humans. For humans, gestation periods are normally distributed with a mean of…

A:

Q: An oceanographer claims that the mean dive duration of a North Atlantic right whale is 11.5 minutes.…

A: Given that  Sample size n =35 Sample mean =12.4 Sample standard deviation =2.1

Q: A random sample of size 21 is selected from Normal distribution with mean 12 and unknown variance.…

A: Given,sample size(n)=21mean(μ)=12standard deviation(s)=4