On the SAT, the average Writing score is 486 points and the average Mathematics score is 522 points. The standard deviation is 85 points on each part of the test. Now suppose 36 test takers are selected. (See exercise 21 on page 326 of your textbook for a similar problem.) Question 97% of the time the sample average writing score should be less than what? (Remember the label.),

Q: On the past math summative exam, the bottom 20% of students failed to pass the test. The mean for…

A: The mean for the test is, μ=55 The standard deviation is σ=11 Consider that the bottom 20% of…

Q: After entering the test scores from her Statistics class of 25 students, the instructor calculated…

A: IQR is obtained as the difference between the third and first quartiles.

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

A: Given, mean=60 Standard deviation=12 To find What percentage of third graders score more than 36,…

Q: In your school with 400 Grade 11 students, the final examination in General Mathematics has a mean…

A:

Q: A group of students wrote an entrance Math exam and the scores were normally distributed. The mean…

A: The scores were normally distributed with mean 750 and standard deviation 95 μ=750σ=95 Z-score is…

Q: For a sample of 300 students, you find that the mean GPA is 3.35 with a standard deviation of .21.…

A: Solution: From the given information, Standard deviation is 0.21 and n=300.

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: or a distribution, the mean is 100 and the standard deviation is 4.  If a data value x has a value…

A: Given data,Mean μ=100sd σ=4If x=90z=?

Q: Isn't here the standard deviation equal to 4, not 2, as the tutor wrote?

A: Solution-: Given: μ=-3,σ=4 We want to find, P(0<X<2)=? Draw the picture.

Q: On the past math summative exam the bottom 20% of students failed to pass the test.the mean for the…

A:

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: Suppose you are told that a computer programmer in Portugal who makes $809.40 has a z-score of -0.50…

A: Solution: It is given that a computer programmer in Portugal who makes $809.40 has a z-score of…

Q: The Wechsler Intelligence Scale for Children is used, in several languages, in the United States and…

A:

Q: oretta, who turns  91  this year, has heard that the mean systolic blood pressure among the elderly…

A: Given: Sample size (n)= 19 Sample mean x¯=130 Sample standard deviation (s) = 20 Hypothesized mean…

Q: On a nationwide math test, the mean was 52 and the standard deviation was 4. If Roberto scored 85,…

A: The z score formula is,

Q: Because of a scoring error, 5 points were added to the test scores of everyone taking a final exams…

A: We have to find effect of error.

Q: The College Board National Office recently reported that in 2011–2012, the 547,038 high school…

A: Hi! Thank you for the question, As per the honor code, we are allowed to answer three sub-parts at a…

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: For a random sample of 40 students, the average statistics midterm score is 73 points (out of a…

A: The sample size is 40, average statistics midterm score is 73 points, and standard deviation is 7.3.

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: 4. On a recent math test, the mean score was 75 and the standard deviation was 5. Mike made 93.…

A: Given that  X~N( μ = 75 , ? = 5 ) μ = 75 , ? = 5 Formula for Z-score  Z-score =( x - μ )/? Note:…

Q: What is the percentile rank of the score 65?   In an English test , the mean is 60 and the…

A: Given X=65μ=60σ=6

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

A:

Q: For a random sample of 10 men, the mean head circumference is x-bar= 57.3 cm and the sample standard…

A:

Q: A nutritionist claims that the mean tuna consumption by a person is 3.5 pounds per year. A sample of…

A:

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: At Thomas Nelson Community College, the Pre-Test for Mathematics has 200 points on the test. The…

A:

Q: The standard deviation on a final examination was 9, while the mean grade was 72. The best 14% of…

A: GivenMean(μ)=72standard deviation(σ)=9

Q: The US department of Agriculture claims that the mean annual consumption of tea by a person in the…

A:

Q: In a qualifying examination for admittance to the BS Psychology. the mean score was 75 and the…

A:

Q: Loretta, who turns 91 this year, has heard that the mean systolic blood pressure among the elderly…

A:

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: On the SAT, the average Writing score is 490 points and the average Math score is 547 points. The…

A: From the provided information, Average Math score (µ) = 547 points Standard deviation (σ) = 89…

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

A:

Q: On an exam, Tom scored 8 points above the mean and had a z-score of +2.00. The standard deviation…

A: Given: z-score=2 Score above the mean=8

Q: A nutritionist claims that the mean tuna consumption by a person is 3.3 pounds per year. A sample of…

A: (a) Let μ denotes the population mean tuna consumption. The claim of the test is that the mean tuna…

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: 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: A student scored 66 on a general science test where the class mean and standard deviation were 82…

A:

Q: Alicia scored a 70 on her psychology quiz, but the class as a whole averaged a 40. If the standard…

A: From the provided information, Population mean (µ) = 40 Standard deviation (σ) = 10 Let X be a…

Q: Loretta, who turns 91 this year, has heard that the mean systolic blood pressure among the elderly…

A: (a) The null and alternative hypothesis is; Ho: μ=120H1: μ>120 (b) Here we will be using…

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

A:

Q: A nutritionist claims that the mean tuna consumption by a person is 3.6 pounds per year. A sample…

A: Given that  Claim :  Mean tuna consumption by a person is 3.6 pounds per year Sample size (n) = 90…

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: 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: A nutritionist claims that the mean tuna consumption by a person is 3.5 pounds per year. A sample of…

A: (a) Let μ is defined as the population mean tuna consumption by a person. The claim of the test is…

Q: The mean for data set is 59, the standard deviation is 4, and the z- score is 0.03, what is the raw…

A: Here given that the mean =59, standard deviation=4, z score=0.04, we need to find the raw score x.

Q: Would it be reasonable to use the standard deviation formula?

A: here  According to a gallup survey of boys 77% of boys had played computer games in the past week…