The average amount of time spent waiting in line at the grocery store is normally distributed with a mean of 3.9 minutes and a standard deviation of .9 minutes. If I take a sample of the next 20 people who wait in line at the grocery store find the probability the mean wait time for this group of 20 people is more than 4 minutes?

Q: The mean amount purchased by each customer on non-medical mask at Chopper Drug Mart is 23 dollars…

A: GivenMean(μ)=23standard deviation(σ)=5sample size(n)=50

Q: The fares received by Uber Drivers working in the City line are normally distributed with a mean of…

A: Let X be a continuous random variable of fares received by Uber Drivers working in the City line are…

Q: Furnace repair bills are normally distributed with a mean of 264 dollars and a standard deviation of…

A: Let X denote the cost of furnace repair bills. Given that X follows Normal(mean = 264, SD = 30)

Q: The amount of snowfall falling in a certain mountain range is normally distributed with a mean of 70…

A: It is given that the amount of snowfall falling in a certain mountain range is normally distributed…

Q: The mean cost of a new Sport Utility Vehicle (SUV) has been found to be $42,500 with a standard…

A: Given that  X~Normal(μ=42500  , σ = 2500) Formula for Z-score    Z-score=(X-μ)/σ

Q: The amount of snowfall falling in a certain mountain range is normally distributed with an average…

A: From the provided information, Mean (µ) = 170 inches Standard deviation (σ) = 20 inches X~N (170,…

Q: The starting salaries of individuals with an MBA degree are normally distributed with a mean of…

A:

Q: The length of timber cuts are normally distributed with a mean of 95 inches and a standard deviation…

A: Given Mean(μ)=95standard deviation(σ)=0.52sample size(n)=45

Q: The ages of patients undergoing a heart surgery in MJPS Hospital are normally distributed with a…

A: For the given data mu =43.5 ,s.d =8.5 ,x =40 p(x>40) = ?

Q: The weekly salaries of teachers in one state are normally distributed with a mean of $980 and a…

A: Let, X=The weekly salaries of teachers in one state  Given that X is normally distributed with a…

Q: The salary for workers at a company are normally distributed with a mean of $60,000 and a standard…

A: Solution: Let X be the salary for workers at a company. From the given information, X follows normal…

Q: Suppose that the amount of cosmic radiation to which a person is exposed when flying by jet across…

A: It is given that the mean and standard deviation are 4.35 and 0.59, respectively.

Q: 3 inches.  If a random sample of 45 men in this age group is selected, what is the probability that…

A: Given :  The heights of 18-year-old men are normally distributed, with a mean of 68 inches and a…

Q: A local fast-food restaurant reports that the mean number of hamburgers it sells per day is 235.0…

A:

Q: At a customer service call center for a large company, the number of calls received per hour is…

A: Z= x-μσ~N(0,1)

Q: The weight of adult male rhesus monkeys is normally distributed, with a mean of 15 pounds and a…

A: We have given that  Mean=mu=15 Standard deviation=sigma=3 X~Normal(mu=15,sigma=3) Find P(x>18.6)

Q: The length of an episode of the hit TV show, Fake Blood, is normally distributed with a mean of 62…

A: Given that  X~Normal(μ=62 , ?=4.5) Mean=μ=62 , Standard deviation=?=4.5)

Q: The Internal Revenue Service reports that the mean federal income tax paid in a recent year was…

A:

Q: The distribution of weekly salaries at a large company is right skewed with a mean of $1000 and a…

A: Given,sample size (n)=50mean(μ)=$1000standard deviation(σ)=$350

Q: A 120-watt fluorescent light has an average brightness of 1986 lumens, with a standard deviation of…

A:

Q: The length of adult parakeets is normally distributed. If the mean length is 8 inches with a…

A: Normal distribution is a continuous probability distribution and it has so many real world…

Q: The medical records of infants delivered at the Kaiser Memorial Hospital show that the infants'…

A:

Q: A manufacturer of a lightbulb claimed that its lightbulbs have a mean lifetime of 700 hours with a…

A: Given Mean=mu=700 Standard deviation=sigma=120 n=144

Q: What is the probability that a randomly chosen light bulb will have a lifetime of more than of 1,000…

A: Let X denote the lifetimes of the light bulb produce by Flip Company. Given that X follows N(mean =…

Q: Suppose the average credit card debt for Americans is $7000 and is not normally distributed with a…

A:

Q: The medical records of infants delivered at the Kaiser Memorial hospital show that the…

A:

Q: The number of orders that come into a mail-order sales office each month is normally distributed…

A: Obtain the standard z-score for the random variable equals 310 orders. The standard z-score for the…

Q: The mean gas mileage for a hybrid car is 57 miles per gallon. Suppose that the gasoline mileage is…

A:

Q: The time student spends on his/her homework is normally distributed with the mean of 122 minutes and…

A: From the given information, the mean value is 122 minutes and standard of 53. That is,  μ=122σ=53

Q: A manufacturer of light bulbs produces bulbs that last a mean of 950 hours with a standard deviation…

A: A manufacturer of light bulbs produces bulbs that last a mean of 950 hours with a standard deviation…

Q: A jar of peanut butter is normally distributed with a mean of 16 oz and a standard deviation of 0.02…

A: Given information- Population mean, µ = 16 oz Population standard deviation, σ = 0.02 oz Let, x be…

Q: The mean cost of a new Sport Utility Vehicle (SUV) has been found to be $42,500 with a standard…

A:

Q: The top-selling Red and Voss tire is rated 70000 miles, which means nothing. In fact, the distance…

A:

Q: The weight of potato chip bags filled by a machine at a packaging plant is Normally distributed,…

A: Given Mean=15 Standard deviations=0.2

Q: The births of a certain mammal happens to be normally distributed with a mean of 238 days and a…

A: From the given information,   Mean = 238 Standard deviation = 13

Q: The Boeing 727 carries 200 passengers and has doors with a height of 72 inches. heights of men are…

A:

Q: The average time to be served at a diner is 12 minutes with a standard deviation of 3 minutes based…

A: Probability that sample mean greater then 13 minutes = 0.0984   Probability that sample mean less…

Q: The weekly salaries of a group of employees are normally distributed with a mean of $800 and a…

A:

Q: Given that pregnancies have a mean of 266 days and standard deviation of 16 days, it is found that…

A: We have given that,  X be the random variable from normal distribution with mean = 266 and standard…

Q: A company that owns a fleet of cars for its sales has found that the service lifetime of disc brake…

A:

Q: The amount of money that college students spend on food each week during the academic year is…

A: Given,mean(μ)=31.28standard deviation(σ)=11.42sample size(n)=10

Q: If we know that the length of time it takes a college student to find a parking spot in the library…

A: It is given that the mean length of time taken by a college student to find a parking spot was 3.5…

Q: At a local restaurant, the amount of time that customers have to wait for their food is hormally…

A:

Q: Furnace repair bills are normally distributed with a mean of 267 dollars and a standard deviation of…

A: Let us denote: X=Furnace repair billsGiven that X follows a normal distribution with mean=267 and…

Q: Given the proper treatment, small puncture wounds have a healing time that is normally distributed…

A:

Q: Suppose the average age at death of a California Adventist is 85.5 with a standard deviation of 5.6…

A: Given Data: Let X represent the random variable Mean=85.5 SD=5.6   Assuming normal distribution X~…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 270 days…

A: Z score: The number of standard deviations the original measurement x is from the value of mean µ is…

Q: mean cost of a new Sport Utility Vehicle (SUV) has been found to be $42,500 with a standard…

A: Given that: μ = $ 42500 ? = $ 2500 By using standard normal distribution we solve this problem

Q: The lengths of a particular animal's pregnancies are approximately normally distributed with a mean…

A: Given  Mean = 275 days  Standard deviation = 20 days

Q: The average height of 4 year-old children is 40 inches with a standard deviation of 2.4 inches. If…

A: The random variable height follows a normal distribution. The population mean is 40. The population…