In a population distribution a score of x equals 28 corresponds to z equals -1.00 and a score of x - 34 corresponds to z equals - 0.50 find the mean and standard deviation for the population

Q: . A population has a mean of  80 and a standard deviation of  20. a. Would a score of X 70 be…

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

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Q: A student has taken a 50-point exam and wants to know how his score of 38 compares to the scores of…

A: It is given that Mean = 40 Standard deviation SD = 4 Score X = 38

Q: A normal distribution has a mean of 60 and a standard deviation of 16. Indicate whether the body is…

A: Using z-score table to calculating above. Z-score=(X-mean)/standard deviation

Q: A normal distribution has a mean of µ = 40 with σ = 10.   What proportion of the scores in this…

A: Obtain the standard z-score for the random variable equals 45 The standard z-score for the random…

Q: A normal distribution has a mean of µ = 80 with σ = 20. What score separates the lowest 30% of the…

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Q: For an educational study, a volunteer must place in the middle 50% on a test. If the mean for the…

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Q: The mean of a set of data is 108.06 and its standard deviation is 115.45 What is the z score for a…

A: Z-score = 3.3045 answer.

Q: The mean income of a group of sample observations is $500; the standard deviation is $40. According…

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Q: The random variable X represents the average number of texts a teenager sends, where the…

A: Given, μ = 450σ = 150To find,P (X > 700) = ?

Q: What is the corresponding z score, mean is 60, standard deviation is 8.1, X=72

A: We have to find z score.

Q: Students receive an A+ on a 60 point test if they score 55 points or more.  The marks of a large…

A: Given: X~N(μ,σ)μ=50σ=5

Q: A normal distribution has a mean of µ = 200 with σ = 20. If a vertical line is drawn through the…

A: Let X be a random variable such that X~N200,202

Q: The mean and standard deviation of a population are 555 and 40, respectively. a. For a sample size…

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Q: For a population, a deviation score is computed as X – σ.

A: What is Deviation score ? Deviation score is basically a degree of score from which a raw score is…

Q: A normal distribution has a mean of 80 with a standard deviation of 20 what score separates the…

A: Let x be the score which follows normal distribution with mean 80 and standard deviation 20. The…

Q: A variable is normally distributed with a mean of 100 and a standard deviation of 10. A student…

A: From the given information,   Mean = 100 Standard deviation = 10

Q: In a normal distribution, mean is 60 and standard deviation is 5. How many of the cases have scores…

A: The probability between two specific numbers a and b in a normal distribution with mean μ and…

Q: Suppose you know that the distribution of sample proportions of nonresidents in samples of 200…

A: Let p^ denotes the sample proportion which follows normal distribution with mean 0.46 and standard…

Q: The mean score in a test is normally distributed with mean 30 and standard deviation 10. What is…

A: Given :  Mean, μ = 30 standard deviation, σ = 10 x = 55

Q: a population was normally distributed with a mean of 10 and standard deviation of 2. What…

A: Given data,Mean μ=10sd    σ=2P(X<12.5)=?

Q: The scores on a standardized exam have a normal distribution. If the mean is 74 and the standard…

A: Given that mean=74  And the given score is 84.  84 is (84-74)=10 scores away from the mean. And…

Q: A  distribution has s standard deviation of σ=8. A score  below the mean by 16 points would have a…

A: Solution: From the given information, σ=8. Suppose the mean is “µ” and the below the mean by 16…

Q: Find P33,

A: Let , X→N(μ=40.5 , σ=53.3) Our aim is to find the P33

Q: A normal distribution has a mean of 100 and a standard deviation of 2. If 69,146% of the data are…

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Q: If the coefficient of variation is 1% and the mean is 3.2, determine standard deviation (to four…

A: We have given that Mean(x̅) = 3.2 CV = 0.01

Q: If the mean score on the final exam is 70 with a standard deviation of 10 then the test score of a…

A: Given Mean =70 Standard deviations=10 Z=-1.5

Q: Suppose the scores of students on a Statistics course are Normally distributed with a mean of 440…

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Q: A normal distribution has a mean of µ = 200 with σ = 20. If a vertical line is drawn through the…

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Q: The scores on a test are normally distributed with a mean of 200 and a standard deviation of 10.…

A: Solution

Q: 2. In a particular normally distributed set of scores, the mean is 65.75 and thestandard deviation…

A: As per the honor code, We’ll answer the first question since the exact one wasn’t specified. Please…

Q: On a test that has a normal distribution, a score of 60 falls one standard deviation above the mean,…

A: Given that the test score has Normally distributed.  A score of 60 falls one standard deviation…

Q: The data in a data set are normally distributed with a mean of 190 and a standard deviation of 20.…

A: Given information Mean µ = 190 Standard deviation σ = 20

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 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: A population is normally distributed with a mean of 20.  What is the population standard deviation…

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Q: A distribution of exam scores has a mean of μ = 78. a. If your score is X = 70, which standard…

A: Given: μ=78 More the z score, better grades obtained from the standard deviation. a. The z score  is…

Q: Alex wants to find out: if the standard deviation of the mean for the sampling distribution of…

A: Solution: given standard deviations of sample s1=9. fir sample size n1=256  Then what will be the…

Q: In certain distribution of numbers,the mean is 70 with a standard deviation of 3. At least what…

A: Given, Mean μ = 70 Standard deviation σ = 3

Q: In a Science test, the mean score is 42 and the standard deviation is 5. Assuming the scores are…

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Q: A distribution of exam scores has a mean of μ = 78. If your score is X = 80, which standard…

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Q: IQ is normally distributed with a mean of 100 and a standard deviation of 15.    In a sample of 500…

A: The normal distribution: A continuous random variable X is said to follow normal distribution with…

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

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Q: The data in a data set are normally distributed with a mean of 150 and a standard deviation of 30.…

A: In this problem, we are going to using The empirical rule(68-95-99.7 Rule)

Q: A distribution of exam scores as a mean of 42.If your score is X=46, which standard deviation would…

A: Given data, μ=42X=46

Q: 2. On a standardized test, Sara had a score of 81, which was exactly 2 standard deviations below the…

A: Given : Test score = X = 81 Standard deviation = σ = 3

Q: Suppose scores on an IQ test are normally distributed, with a population mean of 100. Suppose 20…

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Q: The mean age of a random sample 25 people who were playing the slot machines is 48.7 years, and the…

A: That is, there is no evidence to conclude that the mean age of those playing the slot machines is…

Q: A population of scores has a mean of 56. In this population, a raw score of 40 corresponds to a z…

A: Given Information: A population of scores has a mean of 56. μ=56 Raw score X = 40 corresponds to a z…