Assume that adults have IQ scores that are normally distributed with a mean of 104.6 and a standard deviation 23.1. Find the first quartile Q1​, which is the IQ score separating the bottom​ 25% from the top​ 75%.

Q: Out of 500 people sampled, 380 had kids. Based on this, construct a 90% confidence interval for the…

A:

Q: College students, in general, have a mean of 60 and a standard deviation of 8 on a measure of…

A: Solution-: Let, X= The college students have loneliness scores  Given: We find,

Q: Suppose the exam average in a class is 82% with a standard deviation of 6. What proportion of…

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Q: Assume that the mathematics score on the SAT are normally distributed with a mean of 500 and a…

A: Given

Q: What percent of data points fall in the range of z=-1.5 and z=1.5 standard deviations of the mean

A: From the provided information, The range is between z = -1.5 to z = 1.5

Q: Keenan scored 80 points on an exam that had a mean score of 77 points and a standard deviation of…

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Q: The weights of men in their 30s are normally distributed with a mean of 190 pounds and a standard…

A: From the provided information, Population mean (µ) = 190 pounds Population standard deviation (σ) =…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 99.2 and a standard…

A: Given info: IQ scores are normally distributed with a mean of μ=99.2 and a standard deviation…

Q: An IQ exam has a mean of 110 and a standard deviation of 12. What percent of people have an IQ score…

A: Given mean= 110 Standard deviation=12 We know that Z=X-mean/standard deviation

Q: A standardized measure of achievement motivation is modeled by a normal distribution with a mean of…

A: Obtain the achievement score The achievement score is obtained below as follows:

Q: Suppose that 35% of all adults in a population would say "good" and 65% would say "bad" if they were…

A: Given Data: p=0.35 n=1000

Q: Scores by women on the SAT-1 test are normally distributed with a mean of 988 and a standard…

A: Given Information Now we have to calculate corresponding Z value                         Z = 0.7388…

Q: The height of trees in a nursery is normally distributed with a mean of 56.4 inches and a standard…

A: The height of trees in a nursery is normally distributed with a mean of 56.4 inches and a standard…

Q: The height of women aged 20-29 in the united states are approximately normal with mean 64.2 inches…

A:

Q: Assume that adults have IQ scores that are normally distributed with a mean of 96.6 and a standard…

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: The mean annual income for people in a certain city (in thousands of dollars) is 42, with a standard…

A: The formula for mean of the Z-score is, Z=x¯-μσn Here n is the sample size, μ is the population mean…

Q: The mean rate for cable t.v.from a sample of 80 households was $29 per month with a standard…

A:

Q: Researchers measured the waist sizes of 230 men in a study on body fat. The true mean and standard…

A: Suppose researchers measured the waist sizes of  men in a study on body fat. The true mean:…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 97.3 and a standard…

A: Given data Mean μ= 97.3 Standard deviation ? = 22.8 First quartile is given by Probability = 0.25

Q: The distribution of the weights of dogs at a local rescue shelter is Normal, with a mean of 38…

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Q: A radio station claims that the amount of advertising each hour has a mean of 16 minutes and a…

A:

Q: Assume that adults have IQ scores that are normally distributed with a mean of 102 and a standard…

A:

Q: Use z scores to compare the given values. The tallest living man at one time had a height of 247 cm.…

A: Given information- Population mean, µ = 177.86 cm Population standard deviation, σ = 6.69 cm Height…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.1 and a standard…

A:

Q: The heights of women in a particular community are normally distributed with a mean of 65 inches and…

A: We have to find given proportion..

Q: Assume that the heights of women are normally distributed with a mean of 65.4 inches and a standard…

A: We have given that  Mean=μ=65.4 Standard deviation=σ=2.7 X~Normal(μ=65.4,σ=2.7)

Q: A student earned a 75 on a calculus exam, and she earned a 68 on a linear algebra exam. The calculus…

A:

Q: Suppose that the mean weight for men 18 to 24 years old is 170 pounds, and the standard deviation is…

A: Mean()=170standard deviation()=20

Q: The weights of a particular breed of dog are normally distributed with a mean of 86 pounds and a…

A: Given information- For dog- Population mean, µ = 86 pounds Population standard deviation, σ = 3…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 96 and a standard…

A: We have given that  Mean of 96 and a standard deviation 20.9. X~Normal(μ=96,σ=20.9)

Q: The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures the…

A: Mean = 118.3 Sd =25 N= 25 Hypothesis test Ho :μ = 110Ha:μ > 110

Q: The time needed to take an exam is normally distributed with an average of 120 minutes and a…

A: Given,mean(μ)=120standard devition(σ)=20

Q: The mean height of males 20 years old or older is 69.1 inches with a standard deviation of 2.8…

A: given data x = height of 20 years old or older μ = 69.1  inchesσ = 2.8 incheskevin's height,x = 83…

Q: Use z scores to compare the given values. The tallest living man at one time had a height of 263 cm.…

A:

Q: A study was conducted on shoe sizes of students, reported in European sizes. For the men, the mean…

A: Answer:- Given, In European sizes , the mean size = 43.96  standard deviation = 2.24  Also given…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 95.6 and a standard…

A: Given: x~N(μ,σ)μ=95.6σ=24.3

Q: The mean test score for a history test is 63 with a standard deviation of 9. The mean test score for…

A: It is given that the mean test score and standard deviation for history test are 63 and 9, the mean…

Q: A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what…

A: Given that mean=15 and standard deviation = 2 Let, X= number of hours spent by a student in the…