The number of students passing through Zobel St. was observed and recorded every weekday afternoon since last year. The data set contains 285 observations. The sample mean is 725 and the standard deviation is 25.

Q: The mean marathon finishing time for men and women was 268 minutes and 280 minutes respectively.…

A: From the given information, The mean marathon finishing time for men and women was 268 minutes and…

Q: . What is the probability that the student will get into a college whose entrance score is 550?

A:

Q: students has a mean age of 15.8 years with a standard deviation of 0.6 years. The ages are normally…

A:

Q: A​ half-century ago, the mean height of women in a particular country in their 20s was 63.8 inches.…

A: Given data,μ=63.8σ=2.51If n=28P(X≥65.08)=?

Q: The average hours of sleep on a weeknight was 6.9 hours with a standard deviation of 1.5 hours. What…

A: Given that Mean = 6.9 and Standard deviation = 1.5 Formula z = (x - mean)/ SD

Q: The National Center for Health Statistics reports that the average systolic blood pressure for males…

A: Here, The claim to be tested is "The medical director of a large company believes the average…

Q: The mean electrical energy consumption for Mr Triola’s home for the past two months is 2838 Kilowatt…

A: Given,μ=2838σ=504P(3342<X<3846)=?

Q: If an adult male is told that his height is within 2 standard deviations of the mean of the normal…

A: If an adult male is told that his height is within 2 standard deviations of the mean.

Q: Suppose you are told that a computer programmer in Portugal who makes $809.40 has a z-score of -0.50…

A: Solution: It is given that a computer programmer in Portugal who makes $809.40 has a z-score of…

Q: Second Hand Smoke: Cotinine levels were measured in a group of 40 non-smokers exposed to tobacco…

A:

Q: The SAT scores of all freshmen accepted at State University are normally distributed, with a mean of…

A: Let X be the random variable of SAT scores of all freshman. Given Data: E(X)=1050 SD(X)=120 X~…

Q: at a company, the data set containing the ages of aplicants for a particular job was normally…

A: The mean is 30 years and the standard deviation is 3.5 years.

Q: A study of the Physics and Astronomy department has found that 95% of the graduate students drink…

A: Explanation:Here given the two means and find out the standard deviation of the sample follows the…

Q: for a population with a standard deviation of 5 and mean of 48, draw a bell shaped curve, marking…

A: Given data, Mean=48 sd=5 Draw a bell shaped curve?

Q: According to the records of an electric company serving the Boston area, the mean electricity…

A: GivenMean(μ)=1650standard deviation(σ)=320

Q: The principal decided that the top 30% of the class with the highest grades in statistics will be…

A:

Q: A random sample of 150 physics students were asked how many lab classes he or she was enrolled in…

A: State the hypotheses.

Q: the standard error of the mean for a random sample of 49 tax returns is ________.

A: Given information Mean = $ 1,949 Standard deviation = $750 Sample size = 49

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

A: μ = 800 σ = 190

Q: A​ half-century ago, the mean height of women in a particular country in their 20s was 64.7 inches.…

A: Given that: X is normal Distributed with mean µ = 64.7 and standard deviation σ = 2.88 By using…

Q: A pollster claims that the mean amount spent on Christmas gifts by an American family is $927 with a…

A: From the provided information, Mean (µ) = $927 Standard deviation (σ) = $200 Let X be a random…

Q: The scores on a university examination are normally distributed with a mean of 70 and a standard…

A: The scores of a university are normally distributed with mean 70 and s standard deviation 10.Given…

Q: t is known that the average time required to complete a test exam is 80 minutes and the standard…

A: Given Information: Mean μ=80 min Standard deviation σ=10 min. To find how many minutes should the…

Q: Loretta, who turns 91 this year, has heard that the mean systolic blood pressure among the elderly…

A:

Q: The distribution of the number of hours people spend at work per day is unimodal and symmetric with…

A: Solution-: Given: μ=8hours,σ=0.7hours We find, (a) If Saba’s z-score for his work hours was −1.3 ,…

Q: Is there any systematic tendency for part-time college faculty to hold their students to different…

A: Given, We assume 1 as fulltime faculty; We assume 2 as part timers; Significance level,

Q: The average hours of sleep on a weeknight was 6.9 hours with a standard deviation of 1.5 hours. What…

A: Let, X= The number of hours of sleep on a weeknight. μ=6.9, standard deviation=σ=1.5 We want to…

Q: The average age of senators in the 108th Congress was 58 years. If the standard deviation was 11…

A: Average or mean (μ) = 58 years and standard deviation (σ) = 11 years  Then, We will find the z…

Q: The local police force gives all applicants an entrance exam and accepts only those applicants who…

A: The score that corresponds to the top 15% is, The Z-score that corresponds to the area 0.85 is…

Q: According to the IRS, the average refund issued by the IRS in the 2019 filing season is $1,949.…

A: Given that, Mean = 1949 Standard deviation = 712 Sample size = 64

Q: It is known that the mean is 65 and the standard deviation is 10. There are 30 students in the…

A:

Q: According to the Census Bureau, the mean number of people in a typical American household in 2010…

A: It is given that the mean number of people in a typical American household in 2010 was 2.6 with a…

Q: The Drive-thru lane at Chick-fil-a's mean wait time is 7 minutes with a standard deviation of 2…

A: 8. The standard deviation for sampling distribution of means is, σx¯=σn=210=23.16227766=0.6325

Q: Is there any systematic tendency for part-time college faculty to hold their students to different…

A: Given : n1=125  x1=2.7386  S1=0.63342 n2=88 x2=2.8639 S2=0.50241 We have to calculate t stastics and…

Q: John finds that there is a scholarship available to all persons scoring in the top 5 % on the ACT…

A:

Q: Kurtis is a statistician who claims that the population mean annual salary of an employee in…

A: Test hypothesis:Denote the population mean annual salary of an employee in the city of Yarmouth as…

Q: Loretta, who turns 91 this year, has heard that the mean systolic blood pressure among the elderly…

A: (a) The null and alternative hypothesis is; Ho: μ=120H1: μ>120 (b) Here we will be using…

Q: Cotinine levels were measured in a group of non-smokers exposed to tobacco smoke (n =40), the mean…

A: Introduction: Denote μ1, μ2 as the true mean continine levels in nonsmokers exposed to tobacco smoke…

Q: For each day of last year, the number of vehicles passing through a certain intersection was…

A: Given: Population mean μ=375 Population standard deviation σ=25 Let X ~ N (375, 252)

Q: According to the South Dakota Department of Health, the number of hours of TV viewing per week is…

A: (A) Let X denote the the distribution of hours women watched follows the normal distribution mean of…

Q: The empirical rule states that the percentage of observations in a data set (provided that the data…

A: Empirical Rule: The percentage of values lies between one standard deviation from the mean is 68%.…

Q: on the test was 450 and the standard deviation was 50.  If the board wants to set the passing scores…

A: According to the sum, the board of examiners that administers the real estate broker’s examination…

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

A: Given: Mean of combined scores of students = 880 Standard deviation of combined scores of students =…

Q: The board of examiners that administers the real estate broker's examination in a certain state…

A: Given data: Mean = 494 Standard deviation = 72 To find: The passing score

Q: The average length of a phone call for cell phone users in the United States is 8.4 minutes, with…

A:

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

A:

Q: In a recent​ year, the mean test score was 1539 1539 and the standard deviation was 310 310. The…

A: Given:

Q: The mean salary of all employees in a company is $3,485, and the standard deviation is $1,870. Find…

A:

Q: The scores for all high school seniors taking the verbal section of the Scholastic Aptitude Test…

A: Given distribution is bell shaped. In bell shaped distribution mean, median and mode are equal.…