a math exam, Joel had a score of which was exactly 2 standard iations above the mean. The dard deviation for the test is 3. 90 a. What score was 2 standard deviations below the mean?

Q: The lowest and the highest data value of a data set are 12 and 28 respectively, then the approximate…

A:

Q: LU he leit UI U.)U Cheryl has taken two quizzes in her history class. She scored 15 on the first…

A: 3. Given: For first Quiz, mean is 12 and standard deviation is 2.4. For second Quiz, mean is 11 and…

Q: A successful basketball player has a height of 6 feet 8 ​inches, or 203 cm. Based on statistics from…

A: Consider X is a random variable defined as the height of a successful basketball player.The provided…

Q: The mean of the data is 25.16 and it's coefficient of variation is 18.75 . Find the standard…

A: The coefficient of variance, COV = sx¯*100 s is the standard deviation x¯ is the sample mean To find…

Q: On a nationwide math test, the mean was 63 and the standard deviation was 10. If Roberto scored 85,…

A: GivenMean(μ)=63standard deviation(σ)=10score(x)=85

Q: The arithmetic mean and the standard deviation of a set of 9 items are 43 and 5

A:

Q: are in the 72nd percentile on an exam. The mean was 77 and the standard deviation was 7. What was…

A: From the given information we find the score.

Q: On a spelling test, the standard deviation is equal to 0.94. What does this mean

A: We know that the Standard deviation tells us that how much data is scattered around the mean value…

Q: When you use the standard deviation as a measure of variation, what is the reference point?

A: Standard deviation:The standard deviation indicates by how much each observation differs from 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: In an Algebra class, the scores on a test are normally distributed. The middle 68% of the scores…

A: Given that,The middle 68% of the scores fall between 77 and 93.

Q: Out of a class of 25 students, 24 took an exam in class and got a mean of 74 points and a standard…

A: Given: Total number of students, n = 25            Number of students who gave the test, n' = 24…

Q: If the mean is 8, then the mean absolute deviation of the scores 10 9 3 8 10 is?

A: Given mean (μ) = 8 Then Mean Absolute Deviation is given by  1n∑xi-μ

Q: A successful basketball player has a height of 6 feet 11 inches, or 211 cm. Based on statistics from…

A:

Q: A line for tickets to a broadway show had a mean waiting time of 20 minutes with a statistic…

A: Given: Mean,  μ=20 Standard deviation, σ=5 Sample size, n= 200 Use normal approximation here, the…

Q: In a Science test, the mean is 46 and the standard deviation is 4. Assuming the scores are normally…

A:

Q: In an Algebra class, the scores on a test are normally distributed. The middle 68% of the scores…

A: Given information middle 68% of the scores fall between 76 and 88 As per empirical Rule 68% falls…

Q: Lara wants to know if the number of words on a page in her English book is generally more than the…

A: Given information: The values of mean for the English and history books are 48.9 and 40.5,…

Q: Ava scored a 92 on a test with a mean of 71 and a standard deviation of 15. Charlotte scored a 688…

A: HERE GIVEN , Ava scored a 92 on a test with a mean of 71 and a standard deviation of 15. Charlotte…

Q: CO LO Translate Mikayla and April began arguing about who did better on their tests, but they…

A: Solution The one who have a  higher  score did better.

Q: Tanya takes her Physics test and is told that her Z-score is 3.10. If the class mean was 75 and the…

A: Standard normal distribution:The standard normal distribution is a special case of normal…

Q: the mean for the Verbal Reasoning section was 151 with a standard deviation of 9, and the mean score…

A: Note: According to bartleby experts question answers guidelines an expert can solve only first three…

Q: Assume the test scores in your class are normally distributed with a mean of 84. You scored a 96,…

A: Given: mean = 84.

Q: In an Algebra class, the scores on a test are normally distributed. The middle 68% of the scores…

A: Given: The middle 68% of the scores are falling between 70 and 84.

Q: Looking at the test data, Jason saw that his score was a 2.5 with a mean of 79 and a standard…

A: We will find the actual score as following.

Q: The average life of a car tire is 50,000 miles.  The standard deviation is 2,000 miles   What…

A: Normal distribution, also known as the Gaussian distribution, is a probability distribution that is…

Q: In Statsville, there is a city-wide speed limit of 30 mph. If you are caught speeding, the fine is…

A: Let X be the random variable of drivers who were fined Given Data: E(X)=42 SD(X)=7   Let Y be the…

Q: a nationwide math test, the mean was 60 and the standard deviation was 7. If Roberto scored 85, what…

A: Given data,Mean μ=60sd    σ=7 If Roberto scored 85z-score=?

Q: On a verbal skill test, the mean was 72 and the standard deviation was 7. If John scored 75, what…

A: Given data,Mean μ=72sd      σ=7If John scored 75z-score=?

Q: A population has a Mean of 100 and a standard deviation of 15.  A sample of 20 college students is…

A: Given information- Population mean, µ = 100 Sample mean, x-bar = 125 Population standard deviation,…

Q: What percentage of the widget Weights lie between 55 and 79 ounces when the mean is 61 and the…

A: We have to  given probability...

Q: Michelle earned a 98 on her final exam for biology. The mean score was 78.2 and the standard…

A: Score earned, x = 98 Mean score, μ = 78.2 Standard deviation, σ = 8.4 To evaluate : z-score

Q: Max scored an 80 on her psychology quiz, but the class as a whole averaged a 40. If the standard…

A:

Q: The scores on a psychology exam were normally distributed with a mean of 67 and a standard deviation…

A: The scores on a psychology exam were normally distributed with a mean of 67 and a standard deviation…

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

A: (a) Obtain the percent of score is greater than 48. The percent of score is greater than 48 is…

Q: In a certain test in Calculus, the mean score of a group of 100 students was 30 and the standard…

A: The mean for calculus is 30 and standard deviation is 8, the mean for physics is 52 and standard…

Q: You are given that mean = 50, coefficient of variation = 40% and coefficient of skewness =-0.4. You…

A: Given,mean=50coefficient variation(CV)=40%coefficient of skewness=-0.4

Q: The test scores on the Chapter 10 mathematics test have a mean of 52 and a standard deviation of 10.…

A: Given: Meanμ=52 Standard deviation(σ)-10 Andrea score=86

Q: The Variance for a set of scores is 36, what is the standard deviation, what is the range?

A: Given, variance = 36Therefore,  Standard deviation = square root of variance…

Q: On the final exam, your friend scored a 93 and you scored a 85. The scores are normally distributed…

A: Obtain the Z-score for the random variable X equals 85. The Z-score for the random variable X equals…

Q: On a standardized test, Sara had a score of 93, which was exactly 2 standard deviations above the…

A: The normal distribution in the center is generally denser and basically less dense at tails. There…

Q: In an Algebra class, the scores on a test are normally distributed. The middle 68% of the scores…

A: The random variable score X is normally distributed and middle 68% of values fall between 71 and 83…

Q: The average on the Math section of the SAT was 500 with a standard deviation of 100. What score must…

A:

Q: A successful basketball player has a height of 6 feet 11 ​inches, or 211 cm. Based on statistics…

A:

Q: A researcher in Des Moines, Iowa sampled 56 households and found the mean number of puppies per…

A: # sample size n=56  population mean mu=3.03  standard deviations=1.5  then to find 62nd percentile…

Q: The mean of 7 consecutive integers is 10. What is the standard deviation?

A:

Q: In a given school year, the ACT test mean score was 21 with a standard deviation of 4.9. The same…

A: Z-score :  The z score measures the number of standard deviations that the values are from the mean…

Q: The average score on the Stats midterm was 71 points with a standard deviation of 5 points, and…

A: Given that mean = 71 and SD = 5 And the z score is given by Z = 1

Q: In an Algebra class, the scores on a test are normally distributed. The middle 68% of the scores…

A: Given : The middle 68% of the scores fall between 71 and 79 P(71<X<79)=68%

Q: The mean grade of  Adrian in the final examination in mathematics was 85 and the standard deviation…

A: Mean for mathematics = 85 Standard Deviation for mathematics = 7 Mean for science = 89 Standard…