After the first round of fitness training, the director of a policy academy plan to eliminate the bottom 20% of candidates based on individual fitness cores. Fitness scores were normally distributed, with a mean of 72.0 and a standard deviation of 18.5. What fitness score does a candidate need to stay in the academy?

Q: In a multiple-choice examination in Chemistry, students Mae and Julie received scores of 82 and 65,…

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

Q: 1) Which sample will have the larger mean number of books read? 2) Which sample will have the larger…

A: The given histogram is:

Q: On a scale designed to measure attitudes toward immigration, two college classes scored as follows.…

A: Question 8: Class A: The value of mean for class A is, Mean=∑ixiN=4+6+2+1+1+16=156=2.5 Thus, the…

Q: If the variance of the recorded weights of nine basketball players is 2.36, what is the value of the…

A:

Q: When the data has extreme highs or lows, which is the best measure of central tendency? What is the…

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Q: What is the standard deviation on the graph ?

A:

Q: If you have 100 people in your sample, what would be the degrees of freedom you use to calculate the…

A: Given, n=100 Degree of freedom(df)=?

Q: Entrance exam scores at Cititon University are normally distributed with a mean of 202 and a…

A:

Q: 95% of 80 freshman history students scored between 70% and 80% on a take home quiz. If this data is…

A: Given,  n=80 α= (1-0.95) =0.05 Let X denote the score of freshmen. As per t-distribution table, the…

Q: 2) Explain why the standard deviation would likely not be a reliable measure of variability for a…

A: In order to analyze the standard deviation that will not be reliable based on the measure of…

Q: A large number of applicants for admission to graduate study in business are given an aptitude test.…

A:

Q: The heights of adult men in America are normally distributed, with a mean of 69.5 inches and a…

A: 69.5 2.62 64.4 2.53 American woman:

Q: Twenty-five percent of commercial airline accidents are caused by bad weather. If 300 commercial…

A: The mean of the binomial random variable obtained by the formula μ=np, where (n) is the number of…

Q: A history class has 95 members. If there is a 22% absentee rate per class meeting , find the mean…

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Q: Compute the mean, median, Variance, and the standard deviation for the data below: 3,2 ,3, 4, 3…

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Q: What is the standard deviation of the data set 14,23,9,12,21,18,8

A:

Q: A data set has size of 40. How many observations lie within two standard deviations of either sides…

A: The 68-95-99.7% (Empirical) Rule: For a normal distribution, the empirical rule (68-95-99.7% Rule)…

Q: The Good-Guys Car Dealership has tracked the number of used cars sold at its downtown dealership.…

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Q: What is the effect size?

A: We have to calculate effect size for testing of single mean.

Q: 3. Given the sample variance of a distribution, explain how to find the standard deviation.

A: Variance is the measure of dispersion that calculates the average of the squared difference from the…

Q: A large number of applicants for admission to graduate study in business are given an aptitude test.…

A:

Q: The year Deon graduated college, he got a job as an entry-level software engineer working for a firm…

A:

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

A: It is given that n is 75 and p is 0.12.

Q: In Melanie's Styling Salon, the time to complete a simple haircut is normally distributed with a…

A: Given, Mean = μ =25SD = σ =4

Q: What is the mean, variance and Standard Deviation?

A:

Q: When Lauren runs the 400 meter dash, her finishing times are normally distributed with a mean of 88…

A:

Q: If a data set has values and a standard deviation 7.4, what is the variance?

A:

Q: If a variable has a mean of 53, a median of 62, and a standard deviation of 4, What is its skewness?

A: The formula to find skewness is given below:

Q: Suppose a population has three values 13, 17 and 24. What is the standard deviation of the sampling…

A: Given, Population values are 13, 17 and 24. Samples are drawn without replacement.

Q: If a data set has 25 values and a standard deviation of 7.4, then the variance is?

A: Given: Standard deviation = 7.4

Q: in a group of 230 tests, how many students score within one standard deviation of the mean?

A: The probability that the students score within one standard deviation of the mean will be:…

Q: A bookstore found out that 23 percent of their customers buy a book, 34 percent of their customers…

A:

Q: Entrance exam scores at Cititon University are normally distributed with a mean of 310 and a…

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Q: Which average - mean, median, or mode - is associated with the standard deviation?

A:

Q: During one season of racing at the Talladega Superspeedway, the mean speed of the cars racing there…

A:

Q: Part II. The incomes of the factory workers in a certain province are normally distributed with a…

A: Given mean, μ = 100 Standard deviation, σ = 10 X ~ N(μ, σ)

Q: What is the 25th percentile of a χ2 distribution with 20 degrees of freedom? What symbol is used to…

A: It is an important part of statistics. It is widely used.

Q: Describe  the scores in a sample  that has a standard  deviation of zero

A: If the standard deviation is zero there will be no dispersion of scores from the Mean. It means that…

Q: Allan, a Grade 12 senior high school student, wants to estimate the average number of students who…

A:

Q: 7. A set of data has a variance of 81. What is the standard deviation?

A:

Q: The sample standard deviation is a measure of what?

A: The sample standard deviation is a measure of spread of scores within a sample data.

Q: iven a normally distributed data set whose mean is 25 standard deviation is 5, what values of x…

A: We have to find out answer of given question....

Q: In an all boys school, the heights of the student body are normally distributed with a mean of 71…

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Q: Find the mean and standard deviation of the original set of data.

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Q: What is the formula for the mean absolute deviation formula for paired data sets?

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Q: Given a sample data set with a Variance of 6.25, what is the Standard Deviation of the data set.?

A:

Q: In a multiple-choice examination in Chemistry, students Mikasa and Jean received scores of 82 and…

A: Given problem Given that   In a multiple-choice examination in Chemistry, students Mikasa and Jean…

Q: The weight loss for the first six months of a diet program is normally distributed with an average…

A:

Q: Rosencrantz and Guildenstern are on a weight-reducing diet. Rosencrantz, who weighs 178 lbs.,…

A: Given data,For RosencrantzMean =145sd=15Weight is x=178For GuildensternMean =165sd=20Weight is x=204