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Suppose that, for a certain exam, a teacher grades on a curve. Frequency 2.2% 2.2% 0.1%...
Suppose that, for a certain exam, a teacher grades on a curve. Frequency 0.1% 3 4.1% 34.1% 2.2% L 0.1% 13.6% 13.6% M–30...
Suppose that, for a certain exam, a teacher grades on a curve. Frequency 0.1% 3 4.1% 34.1% 2.2% L 0.1% 13.6% 13.6% M–30 k-20 -lo u+lo u+20 p+30 It is known that the mean is 60 and the standard deviation is 10. There are 35 students in the class. What score would be necessary to obtain an A? or above
Suppose that, for a certain exam, a teacher grades on a curve. It is known that the mean is 65 an...
Suppose that, for a certain exam, a teacher grades on a curve.
It is known that the mean is 65 and the standard deviation is 10.
There are 30 students in the class. (Round your answers to the
nearest whole number.)
a) How many students should receive a C?
(b) How many students should receive an A?
0 22% 34.1% | 34.1% ( 0.1% Ty 0.1% 13.6% 13.6%
0 22% 34.1% | 34.1% ( 0.1% Ty 0.1% 13.6% 13.6%
Suppose that, for a certain exam, a teacher grades on a curve. It is known that...
Suppose that, for a certain exam, a teacher grades on a curve. It is known that the mean is 65 and the standard deviation is 10. There are 30 students in the class. What score would be necessary to obtain an A?
The grades on the last science exam had a mean of 89%. Assume the population of...
The grades on the last science exam had a mean of 89%. Assume the population of grades on history exams is known to be distributed Normally, with a standard deviation of 14%. Approximately what percent of students earn a score between 75% and 89%? A. 14% B. 34.1% C. 15.7% D. 38.5% E. 50% When a certain coin is flipped, the probability of obtaining a tails is 0.60. Which of the following is the probability that tails would be obtained...
The frequency distribution below indicates the numbers of students who earned grades (30s, 40s, etc.) on an exam If one...
The frequency distribution below indicates the numbers of students who earned grades (30s, 40s, etc.) on an exam If one of these students is randomly selected, what is the probability that he earned a grade that is NOT 59 or lower? Taly bars Class interval Frequency 30-39 2 40-49 3 50-59 11 60-69 20 70-79 32 HAI HA H 80-89 25 90-99 THI 7 N 100 Total 84/100 16/100 5/8 95/100
The frequency distribution below indicates the numbers of students...
3. Exam grades across all students across all sections of an introductory statistics class are approximately...
3. Exam grades across all students across all sections of an introductory statistics class are approximately normally distributed with a mean of 72 and a standard deviation of 11. Use the normal distribution to find answer the following questions. a. What percent of students scored above a 90%? b. What percent scored below 60%? c. If the lowest 5% of students will be required to attend an extra study session, what grade is the cutoff for being required to attend...
(2 points) For students in a certain region, scores of students on a standardized test approximately...
(2 points) For students in a certain region, scores of students on a standardized test approximately follow a normal distribution with mean u = 543.4 and standard deviation o = 26.9. In completing the parts below, you should use the normal curve area table that is included in your formula packet. (a) What is the probability that a single randomly selected student from among all those in region who took the exam will have a score of 548 or higher?...
apter 1. Consider the following data on distances traveled by 100 people to visit the local...
apter 1. Consider the following data on distances traveled by 100 people to visit the local park. 1-8 30 25 20 15 10 9-16 17-24 25-32 33-40 Expand and construct the table adding columns for relative frequency and cumulative relative frequency. Then plot Histogram, Frequency Polygon and Ogive Curve. 2. Math test anxiety can be found throughout the general population. A study of 200 seniors at a local high school was conducted. The following table was produced from the data....
. In probability theory, the Normal Distribution (sometimes called a Gaussian Distribution or Bell Curve) is a very common continuous probability distribution. Normal distributions are important...
. In probability theory, the Normal Distribution (sometimes called a Gaussian Distribution or Bell Curve) is a very common continuous probability distribution. Normal distributions are important in statistics and are often used in the natural and social sciences to represent real-valued random variables whose distributions are not known. Describing the normal distribution using a mathematical function is called a probability distribution function (PDF) which is given here: H The mean of the distribution ơ-The standard deviation f(x)--e 2σ We can...
1. Suppose that random variables X and Y are independent and have the following properties: E(X)...
1. Suppose that random variables X and Y are independent and have the following properties: E(X) = 5, Var(X) = 2, E(Y ) = −2, E(Y 2) = 7. Compute the following. (a) E(X + Y ). (b) Var(2X − 3Y ) (c) E(X2 + 5) (d) The standard deviation of Y . 2. Consider the following data set: �x = {90, 88, 93, 87, 85, 95, 92} (a) Compute x¯. (b) Compute the standard deviation of this set. 3....
Suppose that, for a certain exam, a teacher grades on a curve. Frequency 0.1% 3 4.1% 34.1% 2.2% L 0.1% 13.6% 13.6% M–30 k-20 -lo u+lo u+20 p+30 It is known that the mean is 60 and the standard deviation is 10. There are 35 students in the class. What score would be necessary to obtain an A? or above
Suppose that, for a certain exam, a teacher grades on a curve.
It is known that the mean is 65 and the standard deviation is 10.
There are 30 students in the class. (Round your answers to the
nearest whole number.)
a) How many students should receive a C?
(b) How many students should receive an A?
0 22% 34.1% | 34.1% ( 0.1% Ty 0.1% 13.6% 13.6%
0 22% 34.1% | 34.1% ( 0.1% Ty 0.1% 13.6% 13.6%
The frequency distribution below indicates the numbers of students who earned grades (30s, 40s, etc.) on an exam If one of these students is randomly selected, what is the probability that he earned a grade that is NOT 59 or lower? Taly bars Class interval Frequency 30-39 2 40-49 3 50-59 11 60-69 20 70-79 32 HAI HA H 80-89 25 90-99 THI 7 N 100 Total 84/100 16/100 5/8 95/100
The frequency distribution below indicates the numbers of students...
(2 points) For students in a certain region, scores of students on a standardized test approximately follow a normal distribution with mean u = 543.4 and standard deviation o = 26.9. In completing the parts below, you should use the normal curve area table that is included in your formula packet. (a) What is the probability that a single randomly selected student from among all those in region who took the exam will have a score of 548 or higher?...
apter 1. Consider the following data on distances traveled by 100 people to visit the local park. 1-8 30 25 20 15 10 9-16 17-24 25-32 33-40 Expand and construct the table adding columns for relative frequency and cumulative relative frequency. Then plot Histogram, Frequency Polygon and Ogive Curve. 2. Math test anxiety can be found throughout the general population. A study of 200 seniors at a local high school was conducted. The following table was produced from the data....
. In probability theory, the Normal Distribution (sometimes called a Gaussian Distribution or Bell Curve) is a very common continuous probability distribution. Normal distributions are important in statistics and are often used in the natural and social sciences to represent real-valued random variables whose distributions are not known. Describing the normal distribution using a mathematical function is called a probability distribution function (PDF) which is given here: H The mean of the distribution ơ-The standard deviation f(x)--e 2σ We can...
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