An audit finds that the dollar amounts of invoices have a mean of $1,662 and a standard deviation of $302. What is the probability that for a sample of 50 invoices, the average invoice is less than $1,550? a. 0.040 b. 0.9956 c. None of the suggested answers are correct d. 0.437 e. 0.0044

Q: S The age of professional racecar drivers is normally distributed with a mean of 28 and a standard…

A:

Q: In a study of births in 2007, it was found that 51% were male and 49% were female. If 100 people are…

A: Given that there are 51% are male and 49% are female & if 100 people selected randomly we have…

Q: The average credit card debt for college seniors is $3000. If the debt is normally distibuted with a…

A: A) The senior owes at least $1200

Q: Foodland shoppers have a mean grocery bill of R370 with a standard deviation of R100. What is the…

A: Let X be the random variable from normal distribution with mean (μ) = R370 , standard deviation (σ)…

Q: The number of cartoons watched by Mrs. Kelly's first grade class on Saturday moming is shown below.…

A: We have given that x P(x) 0 0.15 1 0.20 2 0.30 3 0.10 4 0.20 5 0.05

Q: In the population, the average IQ is 100 with a standard deviation of 15.A team of scientists wants…

A:

Q: A study indicates that the weights of adults are normally distributed with mean of 72 kg and a…

A: Given data,μ=72σ=8P(65<X<77)=?

Q: What is the probability that a randomly selected individual with an MBA degree will get a starting…

A: Given:  Let x be the starting salary of individual from normal distribution with mean u= $40000 and…

Q: The long-distance calls made by South Africans are normally distributed with a mean of 16.3 minutes…

A: Given,mean(μ)=16.3standard deviation(σ)=4.2

Q: 10. The net meights of all boxes of Top Taste cookies are normally distributed with a mean of 32.07…

A:

Q: The life expectancy of a particular brand of tire is normally distributed with a mean of 30,000 and…

A: Given that.   X~N( μ , ?^2 )   μ=30000    , ?=6000   Z-score =( x - μ )/?

Q: Bundles of firewood are normally distributed with a mean of 20 pounds, and a standard deviation of 2…

A: According to the given information, we have Mean = 20 Standard deviation = 2 Z score = 1.50

Q: If an entire population with μ = 60 and σ = 8 is transformed into z-scores, then the distribution of…

A: If an entire population with μ = 60 and σ = 8 is transformed into z-scores, then the distribution of…

Q: The standard deviation of the lifespan of a certain brand of LED light bulbs Is 20 months. The…

A: We have given that. 1) X~N( μ , ?^2 )   μ =147 , ? =20 , n=70   Z-score =( x - μ )/?

Q: A survey showed the following probabilities of having X number of dogs per household X = number 1 3…

A:

Q: Suppose that people heights (in centimeters) are normally distributed, with a mean of 170 and a…

A:

Q: A census of the labor force in a large metropolitan area found that the time it takes for people to…

A: Given: μ = 20.5 minutes σ = 15.4 minutes  n = 40

Q: Given a random variable X follows a Normal distribution with mean 10 and standard deviation 5, what…

A: Given that, Mean = 10 Standard deviation = 5

Q: A study shows that the normal time that a customer occupied a table in a fine dine restaurant is 1.2…

A: Solution-: Given: μ=1.2,σ=0.4,n=25 We find, (a)  What is the value of the mean of the sample means?…

Q: When the individual weight of a parcel (500 pieces) of oranges is measured, it is seen that the…

A: It is an important part of statistics . It is widely used .

Q: The salaries at a corporation are normally distributed with an average salary of $59,000 and a…

A:

Q: In a random sample of 1000 students, 70% prefer to study at the school campus. The standard error…

A: Solution: Given:   n: size of random sample  = 1000 p: sample proportion          = 0.70…

Q: The daily number of eggs produced by an egg processing machine is normally distributed with a mean…

A:

Q: The weight of football players is normally distributed with a mean of 200 pounds and a standard…

A: From the provided information, Mean (µ) = 200 pounds Standard deviation (σ) = 25 pounds X~N (200,…

Q: A test has a mean score of 150 and a standard deviation of 12. Scores are normally distributed. What…

A: Let X denote the test score and follows normal distribution with mean of μ=150 and standard…

Q: The symbol oz represents the standard deviation of a sample of size n. True O False

A: Answer : B. False

Q: In an effort to improve the quality of dining services, the Dean's Office hired an independent firm…

A:

Q: ed for évents held at City- Community theatre are believed to be normally distributed with a mean of…

A: Given data, μ=12,000σ=1000

Q: Most exhibition shows open in the morning and close in the late evening. A study of Saturday arrival…

A: From the provided information, Mean (µ) = 2 hours and 2 minutes or 122 minutes Standard deviation…

Q: The volume of cracker boxes are normally distributed, with a mean of 7 oz and a standard deviation…

A: It is given that:

Q: A commuter must pass through five traffic lights on her way to work and will have to stop at each…

A:

Q: - The length of time it takes college students to find parking spot at Kean University library…

A: Solution

Q: The number of pages produced by a fax machine in a busy office is normally distributed with a mean…

A: Normal distribution

Q: The lifetime of a computer circuit board is normally distributed with a mean of 2,500 hours and a…

A:

Q: The annual income of residence in certain county is normally distributed with a mean of $42,000 and…

A: The probability that a randomly chosen resident has income over $52,000 is 16% and it is calculated…

Q: 4. Rochester, NY averages u=22.2 inches of snow for the month of December. The distribution of…

A: 4. The population mean is 22.2, and population standard deviation is 6.5. A local jewelry store…

Q: In the month of July, the average electrical Eversource bill in Amherst Massachusetts is $72 with a…

A: Given data,Mean μ=72sd σ=6If n=15P(X<75)=?

Q: A mechanic a brand of automobile tire that has a expectancy that is normally distributedwith a mean…

A: Let X be the random variable for the expectancy. X is normally distributed with a mean of 28,000…

Q: Based on data from 1996-2006 from the Western Regional Climate Center, the average speed of winds in…

A:

Q: . What is the value of the standard deviation of the sampling distribution? A. 0.08 B. 0.4 C. 1.2…

A: We have given that  Standard deviation, σ = 0.4 Sample size, n = 25

Q: A private entity has recorded that the population average of unemployed persons per year in a city…

A: Probability:          Let the total number of possibilities be n and the number of…

Q: The average amount of Vitamin C in a capsule of a multivitamin is 500 mg and the standard deviation…

A:

Q: The Aluminum Association reports that the average American uses 56.8 pounds of aluminum in a year. A…

A: It is given that the mean is 56.8 and standard deviation is 12.3.

Q: Heneroso & Co. distributes Christmas baskets to each employee with a mean cost of 2,500 pesos and a…

A:

Q: 1. A study shows that the cost of new textbook is approximately normally distributed with a mean…

A:

Q: 1) A private entity has recorded that the population average of unemployed persons per year in a…

A: From the given information n = 100 μ=230 x=24 σ=2

Q: The salaries ofelementary school teachers are normally distributed with a mean of $32,000 and a…

A:

Q: "An electrical firm manufactures light bulbs that have a length of life that is approximately…

A: Given data,Mean μ=843sd    σ=35n=31Find mean of sampling distribution?

Q: A population has a standard deviation of 16. If a sample of size 64 is selected from this…

A: Correct answer is (B) 0.6826

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.