Doesn't sound too bad, but which of the following values for the standard deviation would indicate that your grade was actually one of the worst in the class?

Q: People with z-scores above 2.5 on an IQ test are sometimes classified as geniuses. If IQ scores have…

A: Given,   People with z-scores above 2.5 on an IQ test are sometimes classified as geniuses. If IQ…

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

A: Given : Suppose population values 50 and 80 and their corresponding Z scores are -1 and 2 ,…

Q: Suppose the exam average in a class is 82% with a standard deviation of 6. What proportion of…

A:

Q: Dr. Samwell Tarly wants to estimate the number of books checked out of the library in the past year.…

A: It is given that the mean is 10,000 and the standard deviation is 10.

Q: In another company, every worker received a 5% raise. How does this affect the mean salary? The…

A: Every worker received a 5%. The mean defines that the center or average of the data and it is…

Q: Raul received a score of 77 on a history test for which the class mean was 70 with a standard…

A: for history test:mean(μh)=70standard deviation(σh)=4and xh=77For biology test:mean(μb)=70standard…

Q: Linus was visiting the great pumpkin patch where he decided to buy a pumkin from a section of the…

A:

Q: The scores of the students in the final examination in Advanced Algebra are normally distributed…

A:

Q: On a national achievement test score was 850 with a standard deviation of 100. What proportion of…

A:

Q: SAT scores are normally distributed with a mean of 1500 and a standard deviation of 300. ACT scores…

A: Z-Score:             It is a dimensionless quantity that is used to indicate the signed, fractional,…

Q: Which is better a score of 82 on a test with a mean of 65 and a standard deviation of 15, or a score…

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

Q: What is the difference between standard deviation and mean?

A: Standard deviation: The standard deviation is based on how much each observation deviates from a…

Q: What is another name for the standard deviation of the variable x? What is the reason for that name?

A:

Q: Which is better a score of 91 on a test with a mean of 81 and a standard deviation of 15, or a score…

A:

Q: You want to know the percentage of utility companies that earned revenue less than 39 million or…

A: Given data You want to know the percentage of utility companies that earned revenue less than…

Q: on a national achievement test score was 850 with a standard deviation of 100. what proportion of…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: What is the raw z-score?

A: Given information Population Mean = mu= 120 Standard deviation = s= 50 Raw score = x =65 Z score = ?

Q: The vocabulary test scores for the population of third graders is normally distributed with a mean…

A:

Q: If the average score on a statistics exam was 76, and the standard deviation was 7, what can you…

A: Given : The average score on a statistics exam was 76, and the standard deviation was 7

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: based on this graph, would the median be greater than the mean? or the mean gretaer than the median?…

A: Here data is negatively(right) skewedmore data at higher end

Q: Explain an important difference between the standard deviation and the mean.

A:

Q: A class midterm had an average score of 75% with a standard deviation of 4%. Based on your answer…

A: Unusual: When z-score is less than -1.5 and greater than 1.5 then the event is said to unusual. The…

Q: The mean grade for chemistry exam was 76% with a standard deviation of 6%.the mean grade for…

A:

Q: The mean score of the students on pre-assessments is 10 and the standard deviation is 2. What was…

A:

Q: Neil scored 67 on his calculus class final and was devastated by his failing grade. His class…

A: a)  Given information for Neil: x = 67 μ=54,σ=7 By applying normal distribution:-…

Q: A distribution of exam scores has a mean of μ=80. If your score is X = 74, which standard deviation…

A:

Q: Pattys final exams have an average of 78 and a standard deviation of 6.  If she wants 4% of her…

A: X follows a Normal distribution with mean = 78 and S.D = 6 Then z=(x-mean)/SD = (x-78)/6  follows…

Q: The vocabulary test scores for the population of third graders is normally distributed with a mean…

A: given mean μ=60 , standard deviation σ=12 now for the normal distribution z=x-μσ z=x-6012 to find…

Q: Which is better a score of 92 on a test with a mean of 71 and a standard deviation of 15, or a score…

A:

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

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

Q: Many students did an exam, the mean was 15 and the standard deviation was 32 The highest mark was…

A: Given Mean μ=15, standard deviation σ=32  X=103

Q: Explain the empirical rule in your own words. How many standard deviations would it take for you to…

A: Empirical rule:About 68% of data lies within the first standard deviation of the mean.

Q: Your friend, Jaye, who is also enrolled in a statistics class, just got their grade on the first…

A: 1. From the given information, X=67μ=73σ=8Therefore, required Z score will be given by as…

Q: What percent of the students received a score below 64, if the mean grade on a test was 70 and the…

A:

Q: What is the standard error of the mean and how is it different than the standard deviation?

A: Let us consider that we have taken k random samples each of size n from a certain population: Sample…

Q: Is is unusual for someone to run a 4 minute mile if the mean time is 10.2 minutes and the standard…

A: From the provided information, Mean (µ) = 10.2 Standard deviation (σ) = 2.9 X~N (10.2, 2.9)

Q: Jared has a mean of 74 on his quizzes, with a standard deviation of 7. On his most recent quiz, he…

A: If the z-score lies within 2 standard deviation away from the mean, then the score is not unusual…

Q: A test was designed to have a mean of 80 and a standard deviation of 10. A random sample of 20…

A: Computation of test statistic value: The population standard deviation is given, σ = 10. Thus, in…

Q: Explain Why can’t the value of the standard deviation ever be negative?

A: Standard deviation is basically the square root of the variance and variance quantifies the amount…

Q: My Physics professor announced that top 18% will get A in the class.               Class mean is 72,…

A: Let X= score of a student  Given that X follows a normal distribution with mean=72 and standard…

Q: What is the z score for 120 when mean is 100 and standard deviation is 5.

A: We have to find z score for 120 when mean is 100 and standard deviation is 5.

Q: What conclusion can you make base on the standard deviation?

A: Answer:

Q: In simple terms that a normal person can understand. What is population deviation and sample…

A: Difference between the population deviation and sample deviation.

Q: The results of a common standa population mean is 105 and the standard deviation is 30. A subject…

A: A z-score is a numerical measurement that describes a value's relationship to the mean of a group of…

Q: The average score on the Stats midterm was 79 points with a standard deviation of 4 points, and…

A:

Q: My spouse, on the other hand is 77" tall. The mean height for men is 70", and the standard deviation…

A:

Q: on an exam, Tom scores 12 points above the mean and has a z-score of z=+2.00. the standard deviation…

A: It is given that the difference between mean and raw score is 12 and the z score is 2.

Q: IF your mean is 832 and your standard deviation is 86, what values like in the 36% range?? How do…

A: Given Data: Mean=832 SD=86

Q: me mean is 225 and the standard deviation is 28 for a normally distributed variable, what is the x…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…