Suppose that the lifetimes of TV tubes are normally distributed with a standard deviation of  1.2  years. Suppose also that exactly  35%  of the tubes die before  4  years. Find the mean lifetime of TV tub

Q: Suppose the annual employer 401(k) cost per participant is normally distributed with a standard…

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

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Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 144 and a standard…

A: From the provided information, Mean (µ) = 144 Standard deviation (σ) = 27 X~N (144, 27)

Q: The gestation period for human births can be taken as normally distributed with a mean of 256 days…

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Q: Assume that the blood pressure data is normally distributed with a mean of 70.2 and a standard…

A: The variable x¯ is defined as the mean blood pressure levels. The sample size is 16, mean is 70.2,…

Q: Suppose that in an examination, the cut-off score for passing is 75 for 200 persons. If the mean of…

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Q: The ages of the members of a popular ski club is normally distributed with a mean of 46 years and a…

A: Given that the ages of the members of a popular ski club is normally distributed with a mean of 46…

Q: A survey has found out that a family generates an average of 17.2 pounds of garbage per week. Assume…

A: The mean is μ=17.2 and the standard deviation is σ=2.5 The population size is n=55 Therefore the…

Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 116 and a standard…

A: Given information Mean = 116 Standard deviation = 14  between 88 and 116

Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 116 and a standard…

A: From the provided information, Mean (µ) = 116 Standard deviation (σ) = 14 X ~N (116, 14)

Q: A normally distributed data set has a mean of 0 and a standard deviation of 2. What is the percent…

A: Introduction: The fashionable regular distribution, additionally called the z-distribution, is a…

Q: Assume that family incomes are normally distributed with mean 30,000php and a standard deviation of…

A: Given :  Mean = 30000 Sd = 10000

Q: If a distribution has a mean of 50 and a standard deviation of 5, what value would be -1 standard…

A: Given, μ=50σ=5z=-1x=?

Q: Suppose a variable X is normally distributed with a standard deviation of 10. Given that .0985 of…

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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: assume that IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. If…

A: Here we need to find x such that P (X>x)=0.01, where X~N(100,15).

Q: heights of adult women in the United States are normally distributed with a mean of 65 inches and a…

A: The z score can be calculated as: z=x-μσ The required z score that is associated with the top 10% or…

Q: A set of final examination grades in an introductory statistics course is normally distributed, with…

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Q: If the probability of defective bolt is 0.1, find the mean and the standard deviation for the number…

A: Given the probability of a defective bolt is, 0.1 That is, p=0.1 The total number of bolts is, n=400…

Q: Suppose that the heights of 4-year old boys are normally distributed with a mean of 103cm and a…

A: Given that, X: height of the 4-year old boy Mean : μ=103 cmStandard deviation σ =4.05 cm

Q: Suppose that the body temperatures for normal and healthy adults follow a normal distribution with…

A: Obtain the temperature that this clinic will consider it as fever. The temperature that this clinic…

Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 144 and a standard…

A: It is given that the population of a random variable follows normal distribution with mean 144 and…

Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 144 and a standard…

A: Given information Mean = 144 Standard deviation = 27  between 90 and 171

Q: Suppose that 16 samples of pesticide concentrations in plants in Halifax are taken giving a sample…

A: Given,margin of error(E)=2standard deviation(σ)=5.3α=1-0.99=0.01α2=0.005Z0.005=2.58     (from…

Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 144 and a standard…

A: Mean = 144 Standard deviation  = 27

Q: cores of 600 students are normally distributed with a mean of 76 and a standard deviation of 8. What…

A: μ=76, σ=8 The corresponding z-values needed to be computed are: The probability that a student…

Q: Suppose on a chicken farm a random sample of 30 chickens were selected. The mean weight of the 30…

A: Given Data: μ=5.8σ=0.085   We know that X¯~ Normal μ, σ2n

Q: A​ half-century ago, the mean height of women in a particular country in their 20s was 64.7 inches.…

A: Given that: X is normal Distributed with mean µ = 64.7 and standard deviation σ = 2.88 By using…

Q: Assume that women's weights are normally distributed with a mean given by mean=143 lb and a standard…

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Q: A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what…

A: Given that mean=15 and standard deviation = 2 Let, X= number of hours spent by a student in the…

Q: Suppose that heights of women in Utah are normally distributed with a mean of 74 inches and a…

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Q: Suppose that people height (in centimeters) are normally distributed, with a mean of 170 and a…

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

A: Let "X" be the IQ score of adults. Find z-value (z): Refer Standard normal table/Z-table, Lookup…

Q: If the average age of retirement for the entire population in a country is 60 years and the…

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Q: Assume that the test scores for a large class are normally distributed with a mean of 64 and a…

A: Solution-: Given: We find P(the class received a higher score than 78)=?

Q: Suppose that the mean and standard deviation of the scores on a statistics exam are 81.7 and 6.75,…

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Q: Suppose that the lengths of pregnancies are normally distributed with a mean of 269 days and a…

A: P(X<x)=3%=0.03 x=?

Q: If the true mean is 9590 with the standard deviation of 0.0080 within what interval will 98% of…

A: Given that , True mean = 9590 Standard Deviation = 0.0080

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

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Q: Assume that human body temperatures are normally distributed with a mean of 98.23 degrees Upper F…

A: Step-by-step procedure to obtain the percentage using MINITAB:Choose Graph > Probability…

Q: uppose a researcher wants to test if the average diastolic blood pressure in Irish-Americans is…

A: Given data,n=30Population mean μ=70sample mean is x=73sd is s=3test statistic t=?

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 14.7…

A: It is given that the mean is 14.7 and the standard deviation is 2.4.

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

A:

Q: A history class has 75 members.  If there is a 12% absentee rate per class meeting , find the…

A: Given data  P(absent) = p = 0.12  So q= 1-p = 0.88 Sample size (n)= 75 X = no.  of student absent We…

Q: Suppose the midterm exam score for 100 students at UPC had a mean of 70 and a standard deviation of…

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Q: Suppose a population is known to be normally distributed with a mean, μ, equal to 144 and a standard…

A: Given data A population is normally distributed with mean equal to 144 and standard deviation equal…

Q: What is the standard deviation of the commuting time?

A: The standard deviation formula for uniform distribution is, σ=b-a12 The commuting time on a…

Q: The average credit card debt for college seniors is$3262. If the debit is normally distributed with…

A: The distribution of credit card debt is given as, X~N(µ=3262, σ=1100).

Q: Assume that the time a student stays in school is normally distributed with a mean of 5 hours and a…

A: Normal distribution is a continuous distribution which has many real life applications. Normal curve…

Q: Assume that the heights of women are normally distributed with a mean of 63.6 inches and a standard…

A: GivenMean(μ)=63.6standard deviation(σ)=2.5sample size(n)=100