Suppose that IQ scores in one region are normally distributed with a standard deviation of 13. Suppose also that exactly 51% of the individuals from this region have IQ scores of greater than 100 (and that 49% do not). What is the mean IQ score for this region? Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place. ?

Q: Suppose that scores on a particular test are normally distributed with a mean of 140 and a standard…

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

Q: Suppose that the scores on a reading ability test are normally distributed with a mean of 65 and a…

A: It is given that the mean is 65 and the standard deviation is 8.

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A:

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A: Solution-: Let, X= The time required to complete a 1040R tax form Given: We find, P[104R tax form…

Q: Suppose that scores on a particular test are normally distributed with a mean of 120 and a standard…

A: Given information Population mean µ = 120 Standard deviation σ = 17 We have to find the minimum…

Q: Suppose the population values 50 and 80 and that their corresponding z scores are -1 and 2…

A: The z score for the population value of 50 is -1 and the z score for the population value of 80 is…

Q: Suppose that scores on a particular test are normally distributed with a mean of 130 and a standard…

A: A z-test is a statistical test to determine whether two population means are different when the…

Q: Suppose that scores on a particular test are normally distributed with a mean of 140 and a standard…

A:

Q: Suppose that scores on a particular test are normally distributed with a mean of 120 and a standard…

A: From the provided information, Mean (µ) = 120 Standard deviation (σ) = 18 Let X be a random variable…

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Q: Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of…

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Q: Suppose that scores on a particular test are normally distributed with a mean of 130 and a standard…

A: We have to find  correct answer..

Q: A psychologist believes that it will take at least an hour for certain disturbed children to learn a…

A:

Q: Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of…

A: Given Data Population Mean,μ = 110 Population Standard Deviation,σ = 20

Q: Suppose that quiz scores in a beginning statistics class have a mean of 6.5 with a standard…

A: Mean(µ) = 6.5 Standard deviations (σ) = 0.5

Q: Suppose that scores on a particular test are normally distributed with a mean of 140 and a standard…

A: Given X is normal Distributed with mean µ = 140.0 and standard deviation σ = 16.0 now will use…

Q: What proportion of individuals score less than 51   points on this test?

A: given: mean score = 65 standard deviation of the score = 8 we need to find proportion of individuals…

Q: Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of…

A: Obtain the standard z-score for the random variable X equals 124. The standard z-score for the…

Q: Suppose that scores on a particular test are normally distributed with a mean of 120 and a standard…

A:

Q: The distribution of scores on a standardized aptitude test is approximately normal with a mean of…

A:

Q: Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of…

A: The pdf of normal distribution of a random variable X with mean μ and standard deviation σ is given…

Q: Suppose that the scores on a statewide standardized test are normally distributed with a mean of 67…

A: From the provided information, Mean (µ) = 67 Standard deviation (σ) = 6 Let X be a random variable…

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A:

Q: Suppose that the scores on a reading ability test are normally distributed with a mean of 70 and…

A: From the provided information, Mean (µ) = 70 Standard deviation (σ) = 10 Let X be a random variable…

Q: The distribution of scores on a standardized aptitude test is approximately normal with a mean of…

A:

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 11.6…

A: Solution: Let X be the lifespan. From the given information, X follows normal distribution with a…

Q: The distribution of scores on a standardized aptitude test is approximately normal with a mean of…

A: Given that  Mean=mu=500 Standard deviation=sigma=95 X~Normal(mu=500,sigma=95)

Q: In a specific year, SAT scores were Normally distributed with mean 1026 and standard deviation 209;…

A: Solution-: (a) Given: μ=1026,σ=209 We find P(scores will be above 1300)=? (b) Given: μ=1500,σ=250 We…

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A:

Q: If the true mean is 9090 with a standard deviation of 0.0030 within what interval will 95% of the…

A: For standard normal random variable, Mean (µ) =9090 Standard deviation (σ) = 0.0030

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 11.9…

A:

Q: Suppose that the scores on a reading ability test are normally distributed with a mean of 70 and a…

A: Let X denote the scores on reading ability test and it follows normal distribution with mean of μ=70…

Q: Suppose a set of data has a sample mean of 120 and a standard deviation of 14. What is the z-score…

A: Given that we have a set of data that has a sample mean of 120 and S.D. of 14.  µ=120σ= 14 , and we…

Q: Suppose that scores on a particular test are normally distributed with a mean of 110 and a standard…

A: The random variable score follows normal distribution. The population mean is 110. The population…

Q: Suppose that the scores on a reading ability test are normally distributed with a mean of 60 and a…

A: Given that μ=60 and σ=10

Q: Suppose that scores on a particular test are normally distributed with a mean of 140 and a standard…

A:

Q: Suppose that the scores on a reading ability test are normally distributed with a mean of 65 and a…

A: given information: scores of reading ability test normally with μ=65  ,σ=8 we want to find P(test…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.6…

A:

Q: Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of…

A: We have to find given proportion...

Q: The distribution of scores on a standardized aptitude test is approximately normal with a mean of…

A: Given problem is normal distribution. Let, X : Scores on a aptitude test Mean=μ=480 Standard…

Q: The distribution of scores on a standardized aptitude test is approximately normal with a mean of…

A: Given data,μ=490σ=105P(X>x)=15%=0.15x=?

Q: Suppose that scores on a particular test are normally distributed with a mean of 120 and a standard…

A:

Q: The performance on a nationally standardized aptitude test in a certain professional field is…

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Q: A study of the wages of 100 persons grouped in class-intervals of Dollar 10-12, 12 14 ... etc.…

A: Solution:

Q: Suppose that scores on a particular test are normally distributed with a mean of 120 and a standard…

A: A normal distribution is a continuous distribution with many real-life applications. The normal…

Q: Suppose that the scores on a reading ability test are normally distributed with a mean of 65 and…

A: From the provided information, Mean (µ) = 65 Standard deviation (σ) = 8 Let X be a random variable…

Q: A random sample of 100,000 credit sales in a department store showed an average sale of $87.25. From…

A: Given,sample size(n)=100,000population standard deviation(σ)=$20.00mean(x¯)=$87.25

Q: Suppose that the scores on a reading ability test are normally distributed with a mean of 60 and a…

A: The random variable X follows normal distribution. The population mean is 60 and the population…

Q: The distribution of scores on a standardized aptitude test is approximately normal with a mean of…

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.