18. If the mean of a test score is 30 and the standard deviation is 3.7, which score could be expected to occur less than 5% of the time? 35 25 33.8 22

Q: 18. If the mean of a test score is 30 and the standard deviation is 3.7, which score could be…

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Q: According to the Empirical Rule, what percentage of the observations in a data set that can be…

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Q: 29. The standard deviation of a variable is 15. If a sample of 100 individuals is selected, what…

A: Since you have posted more than one question, we are answering the first question as per our rule.…

Q: What percent of the population lies between +1.96 standard deviations above the mean and +2.58…

A: the PDF of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a…

Q: 4.18  stats for the social sciences. According to a recent Current Population Reports, self-employed…

A: GivenThe average time self employed individuals in United States work = 45 hours per weekThe…

Q: A set of data is normally distributed with a mean of 327327 and a standard deviation of 27.27. What…

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Q: 1. A psychology exam has 300 questions with each question worth 1 point. Assume that the…

A: Given information: Let X be the grades in a psychology exam. Then X is a random variable from Normal…

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

A: Given data,μ=144σ=27P(90<144)=?

Q: 1. A set of 125 golf scores are normally distributed with a mean of 76 and a standard deviation of…

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Q: 3. In regard to the standard deviation you calculated on #2, what is one conclusion you can make…

A: You have asked only question 3. So, the answer is given for question 3 below in the next step.

Q: 4. In a study about the life expectancy of 200 thirty-year old males, the mean is 65 and the…

A: We have given that.   X~N( μ , ?^2 )   μ= 65   , ?=10   Z-score =( x - μ )/?

Q: Suppose scores from a certain test were distributed roughly normally, with a mean score of 62 with a…

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Q: 8, and the sample standard deviation, s, is found to be 4.6. ...

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Q: A sociologist found that in a sample of 50 retired men, the average number of jobs they had during…

A: Given that  Sample size=50 , Mean=6.9 Population Standard deviation=2.3

Q: 5. If a population has a standard deviation of 16, what is the minimum number of samples that need…

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Q: 6. Which of the following statistics may be obtained even if not all the values in the data are…

A: Given problem Given that   Which of the following statistics may be obtained even if not all the…

Q: 28. The standard deviation of a variable is 15. If a sample of 100 individuals is selected, what…

A: Given: Standard deviationσ=15 and sample sizen=100. Formula used: Standard Error=σn To find: Sample…

Q: 7) Calculate the vari ence and the standard deviation for the following data 3. 4 Number of children…

A: Given that : A frequency table is here By using this information we calc5 relative frequency and…

Q: 8. (a) The Wechsler Intelligence Scale for Children is approximately normally distributed with mean…

A: Disclaimer: Since you have posted a question with multiple subparts, we will solve first 3 subparts…

Q: What is the average score for those who try to be recognize for all of the time and commitment that…

A: Average score: The general formula to obtain the expected value (mean) of a discrete random variable…

Q: n pulse rate​ (in beats per​ minute) of adult males is equal to 69 bpm. For a random sample of 164…

A: As the population standard deviation is not known, we will use t distribution.

Q: 8. Suppose that monthly cell phone bills are normally distributed with a mean of $96.20 and a…

A: Given Information: Population mean (u) = 96.20  Standard deviation (s) = 12.64 Target value (x) =…

Q: In one town, the number of pounds of leafy greens consumed per person per year has a mean of 10…

A: (1) Standardized z-score:   The standardized z-score represents the number of standard deviations…

Q: (a) If the true mean is .9200 with a standard deviation of 0.0050, within what interval will 99…

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Q: What is the standard deviation for those who are confident about asking questions they don't…

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Q: 3. The heart rate for a group of patients at a local hospital is normally distributed with a mean of…

A: Given that mu = 97,s.d=18

Q: 19. If the mean is 19 and a standard deviation is 3.7 for a normally distributed variable, what is…

A: Here we need to find the z score corresponding to 14.9.

Q: 19. One thousand students took a test resulting in a normal distribution of the scores with a mean…

A: Normal distribution is a continuous distribution function.

Q: If a researcher devises a test of emotional intelligence with a mean of 50 and a standard deviation…

A: We want to find the probability  P(40<X<50)

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: Suppose  X ~ N(5, 2).  What value of x is three standard deviations to the right of the mean? (Enter…

A: We have given that  X~N(5,2).

Q: 8)You are told that the distribution of television weights is normal, with a mean, u of 11.4…

A: Since you have submitted two questions, we'll answer the first question. For the second question…

Q: 2. The height of an adult male is known to be normally distributed with of mean of 69 inches and a…

A: X~N( μ , ?^2 )    μ =69     , ? = 2.5   Z-score =( x - μ )/?

Q: You are provided with a mean of 28.18 with a standard deviation of 4.33.  What percent of students…

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Q: 4. Suppose an interval estimate for the mean was (62.84, 69.46). The population standard deviation…

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Q: Given that a data set has a mean of μ=32.7 and a standard deviation of σ=1.8, find the percent of…

A: As per company guidelines I solved exactly three subparts of the question.thank you

Q: he scores on a standardized mathematics test for 8th grade children in New York State for a normal…

A: mean = 70 standard deviation = 10 a. What proportion of the students in the state have scores less…

Q: 29. The standard deviation of a variable is 15. If a sample of 100 individuals is selected, what…

A: The complete solutions are given below

Q: Suppose that the score in Mathematics exam is normally distributed with a mean of 20 and a standard…

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Q: . A standard test of intelligence is scaled so that the mean IQ is 100, and the standard deviation…

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Q: What is the observed value for the 98th percentile of a population with a mean of 2.5 and a standard…

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Q: 9. Given that IQ scores are approximately normally distributed with a mean of 100 and standard…

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Q: 4. The variance of a data set is 3410.56. Find the standard deviation for the data set.

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Q: 15. A report stated that the average number of times a cat returns to its food bowl during the day…

A: Given Information: Mean μ=15.2 Standard deviation σ=4.16 (a) To find the percentage of cats would…

Q: 3. Several intelligence tests follow a normal distribution with a mean of 100 and a standard…

A: Let X represent the random variable   X~ Normal (100, 15^2)

Q: 3. A data set is normally distributed with a mean of 50 and a standard deviation of 8. What percent…

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Q: About what percent of x values lie between the first and second standard deviations from the mean…

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Q: 5. In a population with m = 65 and s = 6, Fred is 1 ½ standard deviations above the mean, John's…

A: Hi there! Thanks for posting the question. Since there are multiple questions, we will solve one…

Q: Suppose 450 test scores are normally distributed with mean 73.7 and standard deviation 2.5. a. How…

A: Given that  mean = 73.7 and standard deviation =  2.5