Example 2: A study was conducted that found the average number of followers for a Twitter account was 707. Assume this data was normally distributed with a population standard deviation of 82. Use this information to answer the following questions. It can be very useful to draw a quick sketch of what the problem is asking for. a) Find the z-score that would correspond to a twitter account with 800 followers. b) What is the probability that a randomly selected Twitter account would have more than 1000 followers? c) What is the probability that a randomly selected Twitter account would have between 625 and 789 followers?

Q: the scores are normally distributed with a mean of 75 and a standard deviation of 9. What…

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Q: Suppose the population values 50 and 80 and that their corresponding z scores are -1 and 2…

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Q: Assuming that the scores of Grade 11 students in Statistics and Probability in their third quarter…

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

A: Given dataMean = 74Standard Deviation = 9a)The Lowest Score for A grade is given by p-value will be…

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Q: This question again refers to the study on blood pressure which has a normally-distributed set of…

A: From the provided information, Mean (µ) = 120.1 mmHg Standard deviation (σ) = 15.1 mmHg X~N (120.1,…

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

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Q: Given a normally distributed data set whose mean is 35 and whose standard deviation is 6.3, what…

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Q: Solve the following: Given the average age of a man which is 50 years old and has a diabetes with…

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Q: The next four questions refer to the following scenario: A bank collected data of all its customers.…

A: Given Information: Good Credit: x¯=500 σ=75 Bad Credit: x¯=300 σ=75

Q: Suppose that the scores on a statewide standardized test are normally distributed with a mean of 71…

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Q: Solve the problem  27.) If the life, in months, of a certain type of car battery is normally…

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Q: Suppose that quiz scores in a beginning statistics class have a mean of 6.56.5 with a standard…

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Q: Suppose a probability and statistics class took an exam that had a mean of 60 and a standard…

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Q: If 10 were added to each of the values in a data set that originally had a standard deviation of 6,…

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Q: The book Investments by Zvi Bodie, Alex Kane, and Alan Marcus claims that the returns for investment…

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Q: If a sample has a mean of 48 and a standard deviation of 3.2, what is the value in the set that…

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Q: e heights of adult men in the United States are normally distributed with a mean of 70 inches and a…

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Q: In an exam for a statistics class, the class average is 68 with a standard deviation 4. If a student…

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Q: In a normally distributed data set a mean of 55 where 95% of the data fall between 47.4 and 62.6,…

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Q: If the average American sleeps 8 hours a night, with a standard deviation of 1 hour, and I plan on…

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Q: Suppose that the scores on a statewide standardized test are normally distributed with a mean of 71…

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Q: Here is a POPULATION of scores: 4 2 3 2 30. What is the standard deviation for this population of…

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Q: cereal-packing company where the content of cereal boxes must have a mean of 368 grams and a…

A: Solution: Given information: μ= 368 grams Population mean σ= 15 gram  Population standard deviation…

Q: Suppose that for the past several decades, daily precipitation in Seattle, Washington has had a mean…

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Q: Suppose that water usages in American showers are normally distributed, with an average shower using…

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Q: Suppose that the cost of annual tuition at colleges is normally distributed, with an average annual…

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Q: 8. (Topic 8) Suppose the average height of a two year old male is normally distributed with a mean…

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Q: If the average low temperature of a winter month in Rochester, NY is 18∘18∘ and the standard…

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Q: A population has a mean of μ and a standard deviation of  . a. If 3 points were added to every…

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Q: cereal-packing company where the content of cereal boxes must have a mean of 368 grams and a…

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Q: In your school with 400 Grade 11 students, the final examination in General Mathematics has a mean…

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Q: Assume that males have a mean hieght of 69.1 in. with a standard deviation of 2.9 in., and females…

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Q: A health study reported​ that, in one​ country, systolic blood pressure readings have a mean of 122…

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Q: Assume the number of physical damage losses for houses as a result of hurricane Irma in Barbuda is…

A: Given that  X~N( μ = 4000 , ? = 800 ) μ = 4000 , ? = 800 Z-score =(x-μ)/? Note: According to…

Q: As shown in the previous question, the average number of siblings (sibs) is about 3.5, with a…

A: A continuous random variable X follows Normal distribution with parameters μ and σ2 if its…

Q: Using the data below in Figure 1:   For which cases did you need to assume population standard…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: Suppose that water usages in American showers are normally distributed, with an average shower using…

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…

Q: Answer the following by using the z-table from class. People spend an average of 7 hours per day on…

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Q: Example 9: Find the 95% confidence interval for the variance and standard deviation of the nicotine…

A: We have given that,  Sample size (n) = 20 and standard deviation (s) = 1.6  Then,  We will find the…

Q: In a multiple-choice examination in Chemistry, students Mikasa and Jean received scores of 82 and…

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Q: Solve the problem. 13) The amount of snowfall falling in a certain mountain range is normally…

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Q: Suppose that the weights of people who work in an office building are normally distributed with a…

A: From the provided information, Mean (µ) = 165 lb Standard deviation (σ) = 25 lb X~N (165, 25)

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

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Q: Suppose that the scores on a statewide standardized test are normally distributed with a mean of 69…

A: Let X denote the scores on a statewide standardized test and it follows normal distribution with…

Q: Suppose a class average on a test is 75 and the standard deviation is 10. if joe scores 80 on the…

A: