Suppose commute times in a large city are normally distributed and that 65.20% of commuters in this city take more than 22 minutes to commute one-way. If the standard deviation of such commutes is 6.3 minutes, what is the mean commute? (Round your answer to 3 decimal places, e.g. 2.531.)

Q: a manufacturer claims that the mean lifetime of its fluorescent bulbs is 1050 hours. a homeowner…

A: Given n=40 Standard deviation =80 Xbar=1030 Level of significance=0.05 Mu0=1050

Q: A scrap metal dealer claims that the mean of its cash sales is ‘no more than $80’, although an…

A:

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

A: Note: As per the guidelines, only first three sub-parts (1., 2. and 3.) are solved here. Given data:…

Q: Ackerman & Goldsmith (2011) found that students who studied text from printed hard copy had better…

A: From the provided information, Sample size (n) = 10 Sample mean (M) = 77 Sample standard deviation…

Q: In 2011, the national percent of low-income working families had an approximately normal…

A: Thank you for posting this question! Since this question contains multiple sub-parts, I will solve…

Q: A shareholders' group, in lodging a protest, claimed that the mean tenure for a chief executive…

A: For the given data Perform one sample t test

Q: If the average mid twenties male weighs 169lbs. and a weight of 150 is in the 31st. percentile, what…

A: We are given,Mean = μ = 169X = 150Percentile = 31st

Q: Suppose the scores of students on an exam are normally distributed with a mean of 276 and a standard…

A: X~N(μ= 276 , σ= 59 ) μ= 276 , σ= 59 Formula for Z-score Z=(X-μ)/σ

Q: Suppose you found that the average sea- faring bird can fly 8,000 km without stopping. The wandering…

A:

Q: Suppose the scores of students on an exam are normally distributed with a mean of 458 and a standard…

A: A Z-score is a numerical measurement that describes a value's relationship to the mean of a group of…

Q: A shareholders' group, in lodging a protest, claimed that the mean tenure for a chief executive…

A:

Q: In a study of employee stock ownership plans, satisfaction by employees is measured and found to be…

A: Given,mean(μ)=4.89standard deviation(σ)=0.63sample size(n)=450

Q: A researcher wishes to estimate within $5 the average repair cost of for a refrigerator. If she…

A: Population standard deviation is 15.50. The z-critical value for 90% confidence interval is 1.645…

Q: Suppose the average golfer drives the ball around 225.55 yards with a standard deviation of 8.82.…

A: Assume that the random variable x denotes the distance of balls drove by the golfer.

Q: Suppose that the duration of a particular type of criminal trial is known to be normally distributed…

A: Given that, If X is normally distributed, X~N(21,7) Mean,mu = 21, Standard deviation, sigma=7 X =…

Q: Ackerman & Goldsmith (2011) found that students who studied text from printed hard copy had better…

A: We start with defining some of the constants in the question: Sample size n = 10. Population mean…

Q: A shareholders' group, in lodging a protest, claimed that the mean tenure for a chief executive…

A: Given information- Population mean, μ = 9 years Sample size, n = 95 Significance level, α = 0.01…

Q: Suppose that 100,000 recent grads have starting salaries which are normally distributed with a mean…

A: Given that  μ=120,000σ=20,000 b) Consider the probability that the salary above $131,200 is,…

Q: The combined math and verbal scores for students taking a national standardized examination for…

A: GivenMean(μ)=810standard deviation(σ)=280

Q: A light bulb manufacture guarantees that that the mean life of a certain type of light bulb is at…

A:

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

A:

Q: Consider that in a population of Filipino adults ages 18 to 65, Body Mass Index (BMI) is normally…

A: Given that, Mean, mu= 28 And standard deviation, sigma= 6 P(X=x)= 20% = 0.20 We know that,  Z score=…

Q: The current government economic survey wishes to know, with 96% confidence, the average household…

A:

Q: In 2011, the national percent of low-income working families had an approximately normal…

A: Given that, In 2011, the national percent of low-income working families had an approximately normal…

Q: In 2011, the national percent of low-income working families had an approximately normal…

A: From the given information, it can be observed that the population mean, μ = 0.313, population…

Q: Soum that the red blood cell counts of women are normally distributed with a mean of 4.577 million…

A: Solution: Let X be the red blood cell counts of women. From the given information, X follows normal…

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: Suppose that the scores on a statewide standardized test are normally distributed with a mean of 67…

A: From the provided information, Mean (µ) = 67 Standard deviation (σ) = 6 Let X be a random variable…

Q: a florist ahs a floral shop  in miami  and anotherin san diego. Teh miami shop has a mean daily…

A: We need to compute the z-score to find out which store had the better sales.

Q: years. A survey of companies reported in The Wall Street Journal found a sample mean tenure of x =…

A: (a)   The following null and alternative hypotheses need to be tested: Ho: \muμ ≥ 99 Ha: \muμ <…

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 2019 General Social Survey asked a number of teenagers from different countries how much time…

A: To check if there is a larger variety of TV watching times for teenagers in the United States is…

Q: A study of the ages of 100 persons grouped into intervals 20—22, 22—24, 24— 26……, revealed the mean…

A: Given  Mean=μ=32.02, standard deviations=σ=13.18  n=100

Q: ÁČTÍVITY 2: Cris Elevators Inc. claims that the average cost of elevator installation and repair is…

A: Given : n(sample size)=60 Alpha(level of sig.)=0.05 s(sample stand. dev.)=3000

Q: A computer monitors and records how many rings it takes for an operator at a large food products…

A: The provided information are: Confidence level = 90% Margin of error = 1 Using the standard normal…

Q: A high end store is looking to open new stores, but requires that 85% of the households in a…

A: Let X= income of the households  Given that X is normally distributed with mean= 98000 and standard…

Q: The manager of a certain TV station claimed that the average rating of people watching their…

A: We have given that  Hypothesized population mean = 60.5  sample size  =35 Standard deviation =13.5…

Q: Suppose Stock A has had a mean price of $6.58 per share with a standard deviation of $1.88, and…

A: GivenFor stock A:-Mean(μ)=6.58standard deviation(σ)=1.88For Stock B:-Mean(μ)=10.57standard…

Q: Suppose a population is known to be normally distribted with a mean, μ, equal to 116 and a standard…

A: Given information- Population mean, μ = 116 Population standard deviation, σ = 14 So, the percent of…

Q: A district councilor informs the prospective developer of a shopping centre that the average monthly…

A: Solution: Given information: n= 25 Sample size x = 2400 Sample mean μ= 2500 Population mean σ= 200…

Q: The College Board National Office recently reported that in 2011-2012, the547,038 high school…

A: The given information is:

Q: In 2011, the national percent of low-income working families had an approximately normal…

A: The given information is as following: Population mean μ=31.3% Population standard deviation σ=6.2%…

Q: In a certain university, the students were informed that they need a grade in the top 8% of the…

A:

Q: A survey among freshmen at a certain university revealed that the number of hours spent studying the…

A: For standard normal random variable, Mean (µ) = 25 Standard deviation (σ) = 9 X~N (25, 9) Here X be…

Q: In 2011, the national percent of low-income working families had an approximately normal…

A: Given information- Population mean, μ = 0.313 Population standard deviation, σ = 0.062 Sample size,…

Q: Suppose there is a city where the mean cost per month of a one-bedroor apartment is $1,500, with a…

A: The percentage of one bedroom apartments in the city cost between $750 and $1000 is,

Q: A lawyer commutes daily from his suburban home to his midtown office. The average time for a​…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: A study of the ages of 100 persons grouped into intervals 20—22, 22—24, 24— 26......, revealed the…

A: The mean and standard deviation for given data are 32.02 and 13.18.

Q: 1.) It is claimed that the average performance of newly graduated nurses from the recent board exam…

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