Q2/ The number of hours worked by 10 employees of small building firm during a week were: 45 46 34 47 44 42 46 42 43 44 Calculate the mean, median and standard deviation of the hours worked by the

Q: Braceros Car Aircon claims that the average cost of car aircon installation and repairs is…

A: Given : Sample size (n) = 60 Sample mean (X¯) = 10600 Sample S.D (S) = 300 Level of significance (α)…

Q: Assume that the time the student stays in school is normally distrībuted with a mean of 5 hours and…

A:

Q: It is estimated that amounts of money spent on gasoline by customers at a gas station follow a…

A: Given info: amounts of money spent on gasoline by customers at a gas station follow a normal…

Q: The incubation time for Rhode Island Red chicks is normally distributed with mean of 30 days and…

A: Let X be the incubation time for the chicks. It is given, X~N30, 22 To calculate P[24<X<26]…

Q: Assume you are comparing 2 brands of dishwashers. Bfand A has a mean of 72 months with a standard…

A: Standard deviation and mean are related as explained below: If standard deviation is more, then the…

Q: A particular brand of batteries has a mean lifetime of 58.4 months, with a standard deviation of 5.2…

A: Solution: 24. Let X be the lifetime of a battery. The given data is 56.3, 59.2, 61.8, 43.1, 68.8,…

Q: 3. To compare the braking distances for two types of tires, a safety engineer conducts 35 braking…

A:

Q: The amount spent on textbooks for the fall term was recorded for a sample of five hundred university…

A: GivenMean(μ)=500standard deviation(σ)=100student textbook expenditure (x)=700

Q: (a) The average age of Amtrak passenger train cars is 19.4 years. If the distribution of ages is…

A: Solution

Q: On average, Americans have lived in 3 places by the time they are 18 years old. Is this average less…

A: Given  mu=67,Xbar=2.6, s=1.4,alpha=0.05

Q: Suppose that the number of hours that an adult watches in a day has a mean of 2.4 hours and a…

A: Given: Mean, μ=2.4 hours Standard deviation, σ=0.7 hours (i) Percentage of adults watch between 1…

Q: A cereal manufacturer claims that the weight of a box of cereal labeled as weighing 12 ounces has a…

A:

Q: 4. Distribution of heights of elderly English women is known to be normal with a mean height of 160…

A: As per Bartleby guideline expert have to answer first question three subpart only dear student…

Q: A dataset has a mean of 48.1 and a standard deviation of 6.3. What is the z-score of the value 18.5,…

A: Solution  Given That, A dataset has a mean of 48.1 and a standard deviation of 6.3. What is the…

Q: Using the empirical rule, identify the range of values around the mean that includes 95% of sales…

A: Let , X→N(μ=31.6 , σ=7.5) Using the empirical rule, identify the range of values around the mean…

Q: What is the Z-score o the 97 with standard deviation of 11.811 and a mean of 80.2?

A: What is the Z-score o the 97 with standard deviation of 11.811 and a mean of 80.2?…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 104.6 and a standard…

A:

Q: Q4. The average ambunt of A researcher selects a randomsample of 10 cities of Pakistan and the…

A: Average amount of rainfall(μ0)=11.52 inches n=10 Average=7.42 Standard deviation =1.3 Therefore,…

Q: Assume that the time a student stays in school is normally distributed with a mean of 5 hours and a…

A: Given: μ=5 and σ=0.5.   The z-score is calculated asz=x-μσ

Q: The number of hours that full-time employees work per week at a large corporation has a mean of…

A: a) Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

Q: Assume that the heights of men applying for military academy training are normally distributed with…

A:

Q: (d) ABC is unable to adjust the mean of the filling process. However, it is able to adjust the…

A: We have given that.   X~N( μ , ?^2 )   μ=50 , ?=1.25   Z-score =( x - μ )/?

Q: Suppose the graduation rate from the last 5 years at wayne state university hasw standard deviaton…

A: Standard deviation:Standard deviation helps to identify the spread of data for a group from the…

Q: Suppose you want to find if there is any diffference between the mean (average) lifetime of two…

A:

Q: a. Calculate the mean for each group b. Calculate the standard deviation for each group c. In your…

A: Let Xi denote the person without lucky charm and Yi denote the person with lucky charm. Thus, from…

Q: A manufacturer claims that the calling range (in feet) of its 900-MHz cordless telephone is greater…

A: The degrees of freedom is, df=n1+n2-2=13+8-2=19 The degrees if freedom is 19. The significance level…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 103 and a standard…

A: It is given that the IQ scores follow normal distribution with mean 103 and standard deviation 15.…

Q: A light bulb manufacturer guarantees that the mean life of its brand of light bulb is 750 hours. If…

A: Given Information: Hypothesized value of the population mean is μ0=750 Sample size (n) = 36 Sample…

Q: The carapace length of an adult is normally distributed with a mean of 17.55 mm and a standard…

A:

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: Assume the hold time of callers to a cable company is normally distributed with a mean of 5.2…

A: Given that.   X~N( μ , ?^2 )   μ=5.2    , ?=0.9   Z-score =( x - μ )/?

Q: Suppose that employees at a large company have salaries that are normally distributed, with a mean…

A: We have given that, Let X be a random variable i.e. salaries of employees are normally distributed…

Q: What position [how many standard deviations] in the distribution corresponds to z-score of z= -1.00?

A:

Q: The distribution of average hours of sleep per weeknight among college students is found to be…

A: Given Mean=6.5 Standard deviations=1.2

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: 3. The U.S. Department of Agriculture claims that the mean consumption of bottled water by a person…

A: Claim : the mean consumption of bottled water by a person in the United States is 28.5 gallons per…

Q: 2. The manufacturer of soap claims that the average weight of detergent soap per pack is 200 grams.…

A:

Q: A group of ICT students wants to test the claim that average cost of textbooks in the school is more…

A: Let xi; (i=1,2,...,n) be the random sample of size n from the normal population with mean μ and…

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

A: We have given that,  X be the random variable from normal distribution with mean (μ) = 16.4 and…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 104.8 and a standard…

A:

Q: 2. A manufacturer of mugs packages them in boxes of 100.lt is shown that, on the average, mugs weigh…

A: Solution

Q: a sample of n=300 male college freshmen has a mean weight of 160 with a standard devation of 11. how…

A: It is given that the weight of freshmen follows normal distribution with mean of 160 and standard…

Q: The Weather Underground reported that the mean amount of summer rainfall for the northeastern US is…

A: Let µ be the mean amount of summer rainfall for the northeastern US.Claim is that the mean amount of…

Q: 2) The time it take Claudia to drive to work is normally distributed with a mean of 46 minutes and a…

A: The time it take Claudia to drive to work is normally distributed with a mean 46 and standard…

Q: One researcher collected a sample of expenses for advertisement from 5 companies as follows: 50, 60,…

A:

Q: 2. The width of an A4 piece of paper is normally distributed with a mean of 210 and a standard…

A: The mean and the standard deviation is given as μ=210σ=0.2P(X≥x)=0.15 Now, we look the Z-table and…

Q: The following table gives the number of finished articles turned out per day by different number of…

A: Solution is given:

Q: Scores on a test are normally distributed with a mean of 63.2 and a standard deviation of 11.7.…

A: The normal distribution:A continuous random variable X is said to follow normal distribution with…

Q: Assume that the time a student stays in school is normally distributed with a mean of 5 hours and a…

A: Normal distribution is a continuous distribution which has many real life applications. Normal curve…

Q: a) The time a patient must wait before being attended by a physician in a hospital has been observed…

A: (a) The null and alternative hypothesis is, Ho: \mu = 65μ=65 Ha: \mu > 65μ>65 This…