Marks Obtained 10-20 20-30 30-40 40-50 70-80 50-60 60-70 No. of Students 2 3 8 14 8 3 2 Your answer

Q: Prothrombin time (PT) is a blood test that measures the time (in seconds) it takes for blood plasma…

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Q: Calculate and interpret the standard deviation of T

A: The probability distribution of T is: T P(T) T*P(T) T^2*P(T) $600 0.25 $150 90000 $650 0.1…

Q: Use the formula to find the standard error of the distribution of differences in sample means, .…

A: Introduction: Define X1, X2 as denoting a randomly selected observation from Population 1 and…

Q: Scores on a test have a mean of 86 and a standard deviation of 13. Jerrica has a score of 94.…

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Q: neigi a an of б9.0 inches and a standard deviation of 2.8 inches. Find the z-score of a man 79.5…

A: It is given that the mean is 69.0 and the standard deviation is 2.8.

Q: The human population has a mean IQ score of µ = 100 and a standard deviation of σ = 15. Find the…

A: From the given information, µ = 100 and σ = 15.

Q: Assume that adults have IQ scores that are normally distributed with μ=38 and a standard deviation…

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Q: In a​ country, the mean time served by prisoners released from prison for the first time is 31.5…

A: Mean time = 31.5Standard deviation = 16.3

Q: The scores on a mathematics exam have a mean of 71and a standard deviation of 8. Find the x-value…

A: Let X denote the scores on a mathematics exam and it follows normal distribution with mean of…

Q: IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the IQ…

A: Excel formula: =NORMINV(0.305,0,1)=-0.5100

Q: The amount of time spouses shop for anniversary cards can be modeled by an exponential distribution…

A: Let X is the amount of time ( in minutes ) that a randomly selected spouse spends shopping for an…

Q: is called the of the mean. standard error standard deviation O average error sigma

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Q: 1. You are given the losses of two policyholders over a period of three years: Policyholder Year 1…

A: Given the the losses of two policyholders over a period of three years asPolicyholder Year 1Year…

Q: The standard error is an estimator of the standard deviation of the estimator  True  False

A: The statement about standard error is given. Standard error(SE) is the SD(standard deviation) of the…

Q: Scores on a history test have a get age of 55 with standard deviation of 10. What is the z-score for…

A: GivenMean(μ)=55standard deviation(σ)=10student earned score on test(x)=95

Q: the average grade is 84 with a standard deviation of 4. What is each grade for -1 2 0 1.5 -1.25

A: Given Mean μ=84Standard deviation σ=4 The formula for Z score isZ=X-μσX=Z×σ+μ

Q: Assume that 11.7% of adults consider being a professional athlete their dream job. Find the…

A: It is given that p = 0.117 and n =2,760.

Q: Refer to the accompanying table, which describes results from groups of 8 births from 8 different…

A: Solution-: Given probability distribution: Let, X=The number of girls among 8 children X P(X)…

Q: In a population of exam scores, a score of X = 88 corresponds to z = 2 and a score of X = 79…

A: From the provided information, A score of X = 88 corresponds to z = 2 A score of X = 79 corresponds…

Q: U(3, 92) mean and standard deviation

A: Given,A random variable X~U(3,92)f(x)=189  ; 3≤X≤92

Q: Find the estimated mean speed

A: Given Information: Speed (mph) Cars 30-39 7 40-49 16 50-59 51 60-69 16 70-79 10 To…

Q: I also need the standard deviation for the above question.

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Q: What would happen to the margin of error if the standard deviation were to decrease? it would…

A: We know that ,Margin of error=critical value ×standard deviation sample sizeMargin of error =Zα2 ×σn…

Q: On a recent calculus exam, a class mean was 75 with a standard deviation of 3.4. Calculate the…

A: From the provided information, Mean (µ) = 75 Standard deviation (σ) = 3.4 Let X be a random variable…

Q: MAKE SURE YOU SELECT 2 ANSWERS FOR THIS QUESTION - Type of test and hypothesis. A meteorologist…

A: Given population mean μ=0.46  Population standard deviations σ=0.12

Q: Coefficient of variation is ascertained by: a. Standard Deviation/Mean X 100 b. Mean/Standard…

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Q: The distance advanced in a day by a tunnel boring machine, in meters, is uniformly distributed on…

A: From the provided information,The distance advanced in a day by a tunnel boring machine, in meters,…

Q: At a hair salon, customers arrive at the rate of 3 customers per hour. The standard deviation of the…

A: Standard Deviation: A standard deviation is a unit of measure of data spread in proportion to the…

Q: The standard error of an estimator is the standard deviation of the estimator. True False

A: The Standard Error of the estimator is the Standard deviation of the estimator.

Q: Regression and correlation are used for estimation. Select one: True False

A: The most commonly used estimation techniques for investigating the relationship between two…

Q: The human population has a mean IQ score of µ = 100 and a standard deviation of σ = 15. Find the…

A: The normal distribution is the most useful theoretical distribution for continuous variables.…

Q: A standardized exam's scores are normally distributed. In a recent year, the mean test score was…

A: It is given that Mean of test scores = 1537 And SD = 315

Q: Mean 2, x is 5 and z score is 4 find standard deviation

A: Given ,mean(μ)=2Z-score=4and X=5

Q: Assume that the average time for train journeys between London and Brighton is 157 minutes with a…

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Q: When standardizing, the mean becomes 0 and the standard deviation becomes 1. True

A: The formula for standard normal score is, z=x-μσHere μ is the mean andσ is the standard deviation.

Q: t the residents of a local town reported sleeping an average of a=7.97 hours each night with a…

A: Given : sample mean= x̅ = 7.766 population mean=μ = 7.97

Q: A normal distribution has mean u = 56 and standard deviation o = 20. Find and interpret the z-score…

A: Given : Let X follows normal distribution with Mean (μ) = 56Standard deviation (σ) = 20i.e X~N(μ =…

Q: Interpret the Z score for a student who scored an 91 on an exam that had a mean of 86 and a standard…

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Q: Define the mean squared error (MSE)?

A: Mean squared error is the average of the squares of error. It magnifies the error by squaring the…