Three hundred college freshmen's grade point averages are seen to be nearly regularly distributed, with a mean of 2.1 and a standard deviation of 1.2. How many of these freshman do you think will have GPAs between 2.5 and 3.5?

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A: The given value of sample standard deviation is, s = 1.4 Using the standard deviation, the formula…

Q: People with z-scores above 2.5 on an IQ test are sometimes classified as geniuses. If IQ scores have…

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Q: Suppose IQ scores are approximately normally distributed with a mean  of 100 and a standard…

A: Given, Mean =μ=100SD = σ=15

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Q: A quiz consists of 20 true or false questions. If the student guesses on each question what is the…

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Q: To be accepted into an honor society, a student must have a grade-point average (GPA) in the top 10%…

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Q: In a large section of a statistics​ class, the points for the final exam are normally​ distributed,…

A: Given data, Mean = 69 SD = 7

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A: It is given that 29% of the users purchase online. Therefore, probability of a randomly selected…

Q: In a recent year, the ACT scores for high school students with a 3.50 to 4.00 grade point average…

A: The mean is 25.7 and the standard deviation is 3.3.

Q: How many standard deviations to either side of the mean must we go to ensure that, for any data set,…

A:

Q: 95% of 80 freshman history students scored between 70% and 80% on a take home quiz. If this data is…

A: Given,  n=80 α= (1-0.95) =0.05 Let X denote the score of freshmen. As per t-distribution table, the…

Q: In a normally distributed data set with a mean of 24 and a standard deviation of 4.2, what…

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Q: A recent study shows that out of 5, 000 people who moved to Arizona, 2, 350 did so to take a new…

A: From the given information, sample size n = 1000. Total number of people moved n(S) = 5000. Number…

Q: In a normally distributed data set with a mean of 22 and a standard deviation of 4.1, what…

A: According to the given information, we know that The distribution is normal. Mean = 22 Standard…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 261 days…

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Q: What is the standard deviation for the following sample of scores? Scores: 3,2,4,6,6,3

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Q: Students at Arrowhead High School took a Math test with a mean of 120 and a standard deviation of…

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Q: The Good-Guys Car Dealership has tracked the number of used cars sold at its downtown dealership.…

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Q: For a population with a standard deviation of σ = 6, what is the z-score corresponding to a score…

A: We are given:

Q: A score that is 6 points below the mean correspond. to a z-score of z = -2.00. What is the…

A: The following is the formulae for z-score                       i.e., z=X-μσ Here, X is variable…

Q: A college entrance exam scores are approximately normally distributed with a mean value of 145 and a…

A: Solution: Let X be the college entrance exam score. From the given information, X follows normal…

Q: 9) In a class of 30 students, how many students failed the test (below 64), if the mean grade on a…

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Q: 95% of 80 night students scored between 70% and 80% on a quiz. If this data is normally distributed,…

A: Given: Total number of students n=80.             let X  denote the marks of students then,  X ~N(µ,…

Q: For a population with a standard deviation of σ = 5, what is the z-score corresponding to a score…

A: We have to find z score..

Q: A score that is 6 points below the mean corresponds to a z-score of z = -1.50. What is the…

A: We have to find population standard deviation from given information. We need to use z score…

Q: The final exam scores in a statistics class were normally distributed with a mean of 63 and a…

A: The final exam scores in a statistics class were normally distributed with a mean of 63 and a…

Q: If the average salary of a computer programmer is $71, 800 with a standard deviation of 13, 000,…

A: I am attaching image so that you understand each and every step.

Q: A population has a standard deviation of 18 on average how much difference should exist for a random…

A: From the provided information, Population standard deviation (σ) = 18 Sample size (n) = 36

Q: Which of the following would be the standard deviation used in developing the p-control chart?

A: Given:  Proportion of defective product p= 0.03 Sample size n=30  To find standard deviations used…

Q: The scores on the final exam in a statistics course are close to being normally distributed. The…

A: Normal distribution: It is a continuous probability distribution, that is bell-shaped with lighter…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 262 days…

A: Let X be the lengths of pregnancies in a small rural village x¯=262sd=16 X~ Normal (262, 162)   For…

Q: THE SCORES ON THE SAT MATH HAD A MEAN OF 431 AND A STANDARD DEVIATION OF 117. What percent of…

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Q: A population has a standard deviation of 18 on average how much difference should exist for a random…

A: A population has a standard deviation of 18.

Q: For a population with a mean of μ = 45 and a standard deviation of σ = 10, what is the standard…

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Q: Statewide, the population as a whole watches 6.2 hours of TV per day. A random sample of 1017 senior…

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Q: The mean June midday temperature in Desertville is 36°C and the standard deviation is 3°C. Assuming…

A: Determine the number of days in June would be expected the midday temperature to be between 39°C and…

Q: The exam scores of 200 students are distributed normally with a mean of 72 and a standard deviation…

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Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 263 days…

A:

Q: The daily sales at a convenience store have a mean of $1280 and a standard deviation of

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Q: Given a mean of 75 and a standard deviation of 7, what percentage of scores are above 85?

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Q: 3. In the qualifying examination for the admittance to college, the mean score was 65 and the…

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Given IQ scores are approximately normally distributed with a mean of 100 and standard deviation of…

A: From the given information,   Mean = 100 Standard deviation = 15   The objective is to find the…

Q: Interpret the ­z-score of 1.45 in terms of its relationship to standard deviation as well as the…

A: Solution: From the given information, z=1.45.

Q: The IQ scores of a large group of students are approximately normally distributed with a mean of 100…

A:

Q: If a raw score is 28 in a distribution in which the mean is 20 and the standard deviation is 2, what…

A: Given information- Population mean, µ = 20 Population standard deviation, σ = 2 We have to find the…