given a normal distribution with n=1600, x bar=68, s=6 how many people scored at least 75...
given a normal distribution with n=1600, x bar=68, s=6
how many people scored at least 75
only 9% scored below what grade
there are only 80 grades above what grade
how many people differed from the mean by at least 9 points
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given a normal distribution with n=1600, x bar=68, s=6
how many people scored at least 75...
miben so with the 68-95-99.7 Rule) on the included normal distribution 1. Suppose exam scores form...
miben so with the 68-95-99.7 Rule) on the included normal distribution 1. Suppose exam scores form an approximately normal distribution that has 500 points and 100 points. Letter grades on the exam were distributed as follows: Ds made up 15% of the exam, Ca 59%, Bs 13.5%, As 2.5%, and the rest Fs. () If 1466 students scored 733 points or more, how many students took the exam? students (b) What are the point cutoffs for each letter grade? <A...
Assume that class grades follow a normal distribution of mean μ = 75 and the variance...
Assume that class grades follow a normal distribution of mean μ = 75 and the variance σ2 =144. a) Find the probability that an individual's grade is greater than 81. b) What should be the interquartile range? c)Suppose you select at random (and independently) 10 students. What is the probability that only two of these students have a grade greater than 75? d) If you draw a sample of size n = 10 from the population of grades described in...
Example 13: Use Chebyshev's theorem with X = 68, n = 85 and S = 10...
Example 13: Use Chebyshev's theorem with X = 68, n = 85 and S = 10 and do questions a- (a) Calculate the percentage (p) of data points that is within k =3 standard deviations of the mean. Substitute the given value of k into Chebyshev's formula and evaluate p • Write p as a percentage to one decimal place. p88.9% (b) Find the number of standard deviation (k) on either side of the mean that cuts off p=75% of...
Answer the following question involving "The Normal Distribution and the 68-95-99.7 Rule" and show how I...
Answer the following question involving "The Normal Distribution and the 68-95-99.7 Rule" and show how I got the answers below. Answers: 1)a) 68% b) 47.5% c) 2.5% 2) 12 or 13 people Questions: 1) A population of dogs have weights that are normally distributed with an average of 30 pounds with a standard deviation of 3 pounds. a) What percent of the dogs weigh between 27 and 33 pounds? b) What percent of the dogs weigh between 30 and 36...
Part 2. (6 points) Normal Distributions Some companies "grade on a bell curve" to compare the...
Part 2. (6 points) Normal Distributions Some companies "grade on a bell curve" to compare the performance of their managers and professional workers. This forces the use of some low performance ratings so that not all workers are listed as "above average." Ford Motor Company's "performance management process" for this year assigned 10% A grades, 80% B grades, and 10% C grades to the company's managers. Suppose Ford's performance scores really are Normally distributed. This year, managers with scores less...
This is a graded discussion: 10 points possible due Oct 6 The Normal Distribution Answer one...
This is a graded discussion: 10 points possible due Oct 6 The Normal Distribution Answer one of the following questions: Why do we use a bell curve to assess the normality of a variable as opposed to a square, triangle, or some other symmetrical shape? Imagine that you recently took a statistics exam and your instructor just returned your graded exam. The instructor announces that 75% of students scored below the mean. How do you reconcile this with the fact...
given a normal distribution with mu=100 and variance =10 and give, you select a sample,of n=4....
given a normal distribution with mu=100 and variance =10 and give, you select a sample,of n=4. there is a 67% chance that x bar is above what value?
Given a normal distribution with μ-100 and σ-6, and given you select a sample of n-9,...
Given a normal distribution with μ-100 and σ-6, and given you select a sample of n-9, complete parts (a) through (d). Click here to view page 1 of the cumulative standardized normal distribution table. Click here to view page 2 of the cumulative standardized normal distribution table a. What is the probability that X is less than 95? P(X 95) Type an integer or decimal rounded to four decimal places as needed.) b. What is the probability that X is...
just the last ones on this A trucking company determined that the distance traveled per truck...
just the last ones on this
A trucking company determined that the distance traveled per truck per year is normally distributed, with a mean of 80 thousand miles and a standard deviation of 10 thousand miles. Complete parts (a) through (c) below. a. What proportion of trucks can be expected to travel between 69 and 80 thousand miles in a year? The proportion of trucks that can be expected to travel between 69 and 80 thousand miles in a year...
Will rate!! Part 2.(6 polnts) Normal Distrlbutlons Some companies "grade on a bell curve" to compare...
Will rate!!
Part 2.(6 polnts) Normal Distrlbutlons Some companies "grade on a bell curve" to compare the performance of their managers and professional workers. This forces the use of some low performance ratings so that not all workers are listed as "above average." Ford Motor Company's "performance management process" for this year assigned 10% A grades, 80% B grades, and 10% C grades to the company's managers. Suppose Ford's performance scores really are Normally distributed. This year, managers with scores...
miben so with the 68-95-99.7 Rule) on the included normal distribution 1. Suppose exam scores form an approximately normal distribution that has 500 points and 100 points. Letter grades on the exam were distributed as follows: Ds made up 15% of the exam, Ca 59%, Bs 13.5%, As 2.5%, and the rest Fs. () If 1466 students scored 733 points or more, how many students took the exam? students (b) What are the point cutoffs for each letter grade? <A...
Example 13: Use Chebyshev's theorem with X = 68, n = 85 and S = 10 and do questions a- (a) Calculate the percentage (p) of data points that is within k =3 standard deviations of the mean. Substitute the given value of k into Chebyshev's formula and evaluate p • Write p as a percentage to one decimal place. p88.9% (b) Find the number of standard deviation (k) on either side of the mean that cuts off p=75% of...
This is a graded discussion: 10 points possible due Oct 6 The Normal Distribution Answer one of the following questions: Why do we use a bell curve to assess the normality of a variable as opposed to a square, triangle, or some other symmetrical shape? Imagine that you recently took a statistics exam and your instructor just returned your graded exam. The instructor announces that 75% of students scored below the mean. How do you reconcile this with the fact...
Given a normal distribution with μ-100 and σ-6, and given you select a sample of n-9, complete parts (a) through (d). Click here to view page 1 of the cumulative standardized normal distribution table. Click here to view page 2 of the cumulative standardized normal distribution table a. What is the probability that X is less than 95? P(X 95) Type an integer or decimal rounded to four decimal places as needed.) b. What is the probability that X is...
just the last ones on this
A trucking company determined that the distance traveled per truck per year is normally distributed, with a mean of 80 thousand miles and a standard deviation of 10 thousand miles. Complete parts (a) through (c) below. a. What proportion of trucks can be expected to travel between 69 and 80 thousand miles in a year? The proportion of trucks that can be expected to travel between 69 and 80 thousand miles in a year...
Will rate!!
Part 2.(6 polnts) Normal Distrlbutlons Some companies "grade on a bell curve" to compare the performance of their managers and professional workers. This forces the use of some low performance ratings so that not all workers are listed as "above average." Ford Motor Company's "performance management process" for this year assigned 10% A grades, 80% B grades, and 10% C grades to the company's managers. Suppose Ford's performance scores really are Normally distributed. This year, managers with scores...
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