Mr. Jackson is looking at test scores for his Algebra 2 class. The scores on the Unit 2 Test follow a normal distribution, with a mean of 89 and a standard deviation of 3. What percent of learners scored 86 or better?

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 year Ryan graduated college, he got a job as an entry-level software engineer working for a firm…

A: Given,mean(μ)=$70,000Standard deviation(σ)=$5300Ryan's starting salary(X)=$72,000

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

A: GivenMean(μ)=57000standard deviation(σ)=3700starting salary (x)=65000

Q: Yoonie is a personnel manager in a large corporation. Each month she must review the employees in…

A: Solution: It is given that from the past experience of Yoonie, it takes her approximately four hours…

Q: The mean grade on a science test was 79 and there was a standard deviation of 6. If your sister…

A: The z score explains the deviations of the observations from the mean. It is calculated using the…

Q: What would be the effect on the standard deviation of the set of scores 13, 14,15, 15, 16, and 17 if…

A: We have to find effect of membres on standard deviation.

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

A: Solution

Q: Molly earned a score of 920 on a national achievement test. The mean test score was 825 with a…

A: Given that, The proportion of students had a higher score than Molly is,

Q: Russell is doing some research before buying his first house. He is looking at two different areas…

A:

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: 500 freshmen at Crescent High School took an algebra test. The scores were distributed normally with…

A: Normal Distribution: A continuous random variable X is said to follow Normal distribution with…

Q: compare the given values. The tallest living man at one time had a height of 264 cm. The shortest…

A: Mean=173.67Population standard deviation=8.72

Q: Angela polled her first grade class about their family pets. The following data lists the number of…

A:

Q: Assuming that both tests measure the same kind of ability, who had the relatively higher score? It…

A: Linda's Standardized score: We want to compute the Z-score for the raw score X=680X = 680. The…

Q: In preparation for the upcoming school year, a teacher looks at raw test scores on the statewide…

A: Given data,Mean μ=49sd σ=20.7z-score =2Test score X=?

Q: One year, many college-bound high school seniors in the US took the SAT. For the verbal portion of…

A: According to the given information in this question We need to find the percentage of students would…

Q: For a standardized psychology examination intended for a psychology. Major is the historical data…

A: sample size(n)=35mean(μ)=510standard deviation(σ)=170

Q: Consider the following distribution of scores: 2,5,3,7,6,5. What is the mean?

A:

Q: Laura learned that the average GPA in her school is 3.6 with a standard deviation of 0.3. If her GPA…

A: From the given information,   Mean = 3.6 Standard deviation = 0.3   The objective is to find the…

Q: The distribution of heights of both five‑year old boys and seven‑year old boys is approximately…

A: The z-score for John's at age 5 is, z=x-μσ=44-431.8=11.8=0.556 Thus, the z-score for John's at age 5…

Q: John got 83 on a test, with a standard deviation of 10.73 and the class mean was 77.1. Paul got 88…

A: From the provided information, John got (X) 83 on a test with a standard deviation (σ) of 10.73 and…

Q: A student learns that on his most recent exam in psychology, the sample mean was 72.19 with a…

A:

Q: A statistician was exploring a set of data representing a group of 121 women.  The mean was 49 and…

A: Sample size, n = 121 Mean = 49 Variance σ2 = 9 We have to find the standard deviation.

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: On Bob's last history test, he had a score of 92.  Bob's z-score was -0.5, and the test's standard…

A: Solution -Given that Score in History test be X=92 Z- Score=-0.50 Standard deviation= 6 Find mean…

Q: The City UHIver Departmer Math 150 Mid ny 5 questions. If you be evaluated, but on y equal weight.…

A:

Q: A large chemistry course took their final exam. The mean was 75 with a standard deviation of 8. What…

A: Let us define the random variable , X. Let X represent the final exam scores. Here X follows Normal…

Q: student scored in the 75th percentile on the SAT. What does that mean?

A:

Q: Russell is doing some research before buying his first house. He is looking at two different areas…

A: we have given that We need to construct the 95\%95% confidence interval for the difference between…

Q: Salomé and Latasha began arguing about who did better on their tests, but they couldn't decide who…

A: Salome's test grade: Mean = 73.7 , Standard deviation = 10 Social studies = 80.8 Latasha's test…

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

A: To find the z-score of Lamar's starting salary relative to the starting salaries of all entry-level…

Q: If you score 76 on a commercial pilot exam that has a mean score of 70 and a standard deviation of…

A: We have to find given percentile ....

Q: SAT scores have a mean of 1026 and a standard deviation of 209. ACT scores have a mean of 20.8 and a…

A:

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

A: Given, Mean = 50, Coefficient of Variation (CV) = 40% Coefficient of skewness = - 0.4.

Q: Professor Ivy’s students have a Mean grade of 69.5 and a Standard Deviation of 6.5.  If Johnny has…

A: From the provided information, Mean (µ) = 69.5 Standard deviation (σ) = 6.5 Let X be a random…

Q: A student takes a test in his math course and scores 45 points and a test in his psychology…

A: Introduction:Consider X as a normally distributed random variable, with mean μ and standard…

Q: Jason's z- score in the 10-k run was -3. if the raw score standard deviation was 5, and the mean…

A:

Q: A class has an equal number of boys and girls. The boys all got 78% on a test and the girls all got…

A: From the provided information, Boys got 78% on a test and girls got 84%. Let n = number of girls =…

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

A: