A student knows correct answers to 10 questions out of 12 questions from the book. (A) If a professor asks 9 questions from the book, what is the probability that a student knows correct answers to more than 7 of these questions? (B) Let X be the number of questions that can be answered correctly by the student from a sample of 9 questions asked by the professor. Find the mean and the standard deviation of X.

Q: A population has a mean of 80 and a standard deviation of 7. A sample of 49 observations will be…

A:

Q: A population has a standard deviation of 25 and a mean of 300. Given a random sample of size 100,…

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Q: . A random variable X is normally distributed with a mean of 25 and a standard deviation of 5. What…

A: A random variable X is normally distributed with a mean of 25 and a standard deviation of 5.

Q: A population has a standard deviation of 16. If a sample of size 64 is selected from this…

A:

Q: A random sample of 25 observations yield a mean of 116 and a standard deviation of 12. What is the…

A: Given data,Mean μ=116sd σ=12P(X>1150)=?

Q: Suppose average study hours of students passing Statistics Lecture was 75 hours and standard…

A: Given that, Mean = 75 Standard deviation = 25

Q: Suppose the scores on an IQ test are normally distributed. If the test has a mean of 100 and a…

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Q: The IQs of 600 applicants of a certain college are normally distributed with a mean of 115 and a…

A: Answer - The IQ of  n = 600 applicants of a certain college are normally distributed…

Q: A worldwide organization of academics claims that the mean IQ score of its members is 115, with a…

A: mean IQ score of its members is 115 standard deviation of  16 A randomly selected group of 35…

Q: A population has a mean of 200 and a standard deviation of 25. A sample of 64 observations will be…

A: We have to find out given probabiity..

Q: A student knows correct answers to 6 questions out of 9 questions from the book. (A) If a professor…

A: given that n= 5 p=6/9 Find ( A )p(x>=4)=? ( B) expected value =? standard deviation =?

Q: The standard deviation of monthly rents paid by students in a particular city is assumed to be $ 60.…

A: Given, σ = 60 n = 150 we have to find 1.    P( x- < μ + 8 ) 2.    P ( x- < μ - 6 ) where,  Z =…

Q: The standard deviation of monthly rents paid by students in a particular city is assumed to be $ 60.…

A: a) From the given information, the standard deviation of monthly rents paid by students in a…

Q: The standard deviation of monthly rents paid by students in a particular city is assumed to be $ 60.…

A: Given information: Population standard deviation σ=$60

Q: a random sample is selected from a population with a standard deviation of 18. On average, how much…

A: We have to find standard error for given data.

Q: A person passing through an intersection will find someone running the red light with probability…

A: Obtain the probability that in her next 5 passing through the intersection, she will see no one…

Q: The average age of all employees is 25 years, and the standard deviation of the ages of all…

A: Given,sample size(n)=100mean(μ)=25standard deviation(σ)=3

Q: The annual family expenditure of 421 families in the main city is normally distributed with a mean…

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

Q: If the random variable x is normally distributed with a mean of 88 and a standard deviation of 12,…

A: Given that, Mean = 88 Standard deviation = 12

Q: Suppose we know that the mean score among the population of college students taking the GMAT test is…

A: given;X: the score among the population of college students taking the GMAT testpopulation…

Q: The manufacturer of cans of salmon that are supposed to have a net weight of 6 ounces tells you that…

A: Given,sample size(n)=33mean(μ)=5.97standard deviation(σ)=0.1

Q: SAT scores (out of 2,400) are normally distributed with a mean of 1,500 and a standard deviation of…

A: It is given that the mean and standard deviation are 1,500 and 300, respectively.

Q: The average score of employees on mental examinations is 110. Suppose that nothing is known about…

A: We have given that, Mean (mu) = 110    SD(sigma) = 28   n= 90 Mean(x-bar) = 102

Q: The weights of a group of athletes are normally distributed with a mean of µ= 200 and a standard…

A: Given data: Mean(µ) = 200  standard deviation of (σ) = 25. Sample size (n) = 16 athletes To find:…

Q: f a pipe’s diameter exceeds 24 inches, it is useless to a buyer. A buyer receives a shipment of 10…

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Q: A population has a standard deviation of 16. If a sample of size 64 Is selected from this population…

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Q: Suppose it is known that the average score of all high school seniors taking a national test of…

A: Chebyshev's theorem and empirical rule are used to calculate the percentages of data lies within…

Q: a random sample is selected from a population with a standard deviation of  56. On average, how much…

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Q: oup of 10 friends played a mini-golf competition. Eight of the friends tied for second place, each…

A: Given: Let the missing score be a. The data for scores (X) is shown below 34 34 34 34 34…

Q: A random sample of 25 observations yield a mean of 106 and a standard deviation of 12. What is the…

A: It is given that mean and standard deviation are106 and 12, respectively.By using central limit…

Q: The average score of employees on a mental examination is 120. Suppose that nothing is known about…

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Q: In a recent​ year, the total scores for a certain standardized test were normally​ distributed, with…

A: Given data,μ=500σ=10.7P(X>529)=?

Q: Given that pregnancies have a mean of 266 days and standard deviation of 16 days, it is found that…

A: We have given that,  X be the random variable from normal distribution with mean = 266 and standard…

Q: An airliner carries 350 passengers and has doors with a height of 72 in. Heights of men are normally…

A: From the given information, let X be the men passengers height. Number of men passengers n = 175.…

Q: In 2000, the average height of a woman aged 20–74 years was 64 inches with an increase of…

A: Given that: X is normal Distributed with mean                   µ = 64.0 and standard deviation σ =…

Q: The probability that a randomly chosen student in a statistics class submits his/her homework on…

A: X~Bin(n=46, p=0.39)

Q: The probability that a randomly chosen student in a statistics class submits his/her homework on…

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Q: A new species of dragonfly has an approximate body length of 45 mm with a standard deviation of 3…

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Q: In a test taken by a large number of students, the average score of the test takers is 90 and the…

A: The mean is 90 and the standard deviation is 4.

Q: The standard deviation of monthly rents paid by students in a particular city is assumed to be $ 40.…

A: Given: Standard deviation of monthly rent paid by students, σ=40.            Let X denotes the…

Q: 11. If the scores for an 1Q Test have a mean of 100 and a standard deviation of 15, find the…

A: We have to find given probability.

Q: The distribution of heights for men in the United States is approximately normal, with a mean of μ =…

A: Where,

Q: A population is normally distributed with a mean of μ = 45 and a standard deviation of σ = 4. What…

A: Given that, Mean = 45 Standard deviation = 4

Q: Suppose it is known that the average score of all high school seniors taking a national test of…

A:

Q: Suppose that SAT scores among U.S. college students are normally distributed with a mean of 500 and…

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Q: Suppose it is known that the average score of all high school seniors taking a national test of…

A:

Q: The average number of moves a person makes in his or her lifetime is 12. If the standard deviation…

A: Given,   Mean = 12 Standard deviation = 3.2 Sample size = 30