A sample of size 49 is taken from an infinite population whose mean and standard deviation are 450 and 67, respectively. The probability that the sample mean is less than 435 equals: O PIZ <-1.567) O PIZ > 10.97) O P(Z< -10.97) O P(Z > 1.567)

Q: A certain machine makes electrical resistors having a mean resistance of 100 Ohms and a standard…

A:

Q: In a certain region, the mean annual salary for HVAC contractors is $53,100. Let x be a random…

A: In a certain region mean annual salary for HVAC contractors is $53100. Therefore, μ = $53,100. Let X…

Q: . A random variable X is normally distributed with a mean of 25 and a standard deviation of 5. What…

A: A random variable X is normally distributed with a mean of 25 and a standard deviation of 5.

Q: If the intelligence quotients (IQ) of all human beings are assumed to be norma distributed with mean…

A: The mean is 100 and the standard deviation is 10.

Q: Suppose a random sample of 10 people have their temperatures taken. What is the probability that all…

A: Given Mean=97.7 Standard deviations=0.6 n=10

Q: Assume that blood pressure readings are normally distributed with a mean of 125 and a standard…

A: Solution-: Let, X= The blood pressure reading  Given: μ=125,σ=4.9,n=34 ∴X→ N(μ=125,σ2=4.92)

Q: The tip percentage at a restaurant has a mean value of 18% and a standard deviation of 2%.…

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Q: Random samples of size 81 are taken from an infinite population whose mean is 66 and standard…

A:

Q: An airliner carries 350 passengers and has doors with a height of 74 in. Heights of men are normally…

A: X follows a Normal distribution with mean = 69 and S.D = 2.8 Then z=(x-mean)/SD = (x-69)/2.8…

Q: For a random variable that is normally distributed, with a mean of 80 and standard deviation of…

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Q: Let x denote the time it takes to run a road race. Suppose x is approximately normally distributed…

A: The mean and standard deviation are 190 and 21, respectively.

Q: Assume that blood pressure readings are normally distributed with a mean of 122 and a standard…

A: The following information has been given: Let X be a random variable represents the blood pressure…

Q: Suppose that a population is known to be normally distributed with mean = 2,000 and standard…

A: GivenMean(μ)=2000stanadard deviation(σ)=230sample size(n)=16

Q: Assume that blood pressure readings are normally distributed with a mean of 115 and a standard…

A: # reading of blood pressure follow normal distribution with mean 115 and sd=4.8  sample of size n=32…

Q: The average score of freshmen on an aptitude test at a certain university is 540, with a standard…

A: Solution-: Given: μ=540,σ=50, nx=32,ny=50 We want to find , (a) P(differ in their average scores by…

Q: The distribution of the number of words in text messages between employees at a large company is…

A:

Q: The average number of moves a person makes in his or her lifetime is 12. If the standard deviation…

A: From the provided information, Mean (µ) = 12 Standard deviation (σ) = 3.2 Sample size (n) = 36 a)…

Q: An insurance company has 5000 policies and assumes these policies are all independent. Each policy…

A:

Q: Assume that the readings at freezing on a bundle of thermometers are normally distributed with a…

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Q: Suppose a population has a mean of 400 and a standard deviation of 24. If a random sample of size…

A: Given that, mean = 400 standard deviation =  24 n = 144

Q: Suppose that the monthly incomes of all employees in Firm A are normally distributed with a mean of…

A: Given: Let us define the random variable X as the monthly income of employees in firm A. Mean = μ =…

Q: The average life of a bread-making machine is 8 years, with a standard deviation of 2. Assuming that…

A: From the provided information, Mean (µ) = 8 years Standard deviation (σ) = 2 years Let X be a random…

Q: A sample of size 45 will be drawn from a population with a mean 10 and standard deviation 5. find…

A:

Q: let x be a random variable that represents the commute time of teachers in a large urban area. If x…

A:

Q: An airliner carries 350 passengers and has doors with a height of 72 in. Heights of men are normally…

A: From the given information,   An airliner carries 350 passengers and has doors with a height of 72…

Q: A population which has a size of N=100 has a mean of 50 and a standard deviation of 10. What is the…

A:

Q: A random variable X has a mean value of 20 with a standard deviation of 4.  If we obtain a random…

A:

Q: Assume that women's heights are normally distributed with a mean given by μ=64.5 in, and a standard…

A: Here, the mean, µ is 64.5 in. and the standard deviation, σ is 3.1 in.

Q: In a manufacturing process, the diameter of steel rods is distributed normally with a mean value of…

A:

Q: An article in a journal for college instructors recently stated that college students spend on…

A: We have to find given probability..

Q: Assume that blood pressure readings are normally distributed with a mean of 122 and a standard…

A: Given that  Mean = μ = 122 Standard deviation = σ = 6.4 Sample size = n = 64 X ~ Normal ( μ = 122 ,…

Q: A population of widgets produced by a machine has weights with mean of 200mg and standard deviation…

A:

Q: Assume that the readings at freezing on a bundle of thermometers are normally distributed with a…

A:

Q: According to a recent study, students at land-grant universities spend between $650 and $950 per…

A: Given :  The students at land - grant universities spend between $650 and $950 per year on…

Q: The tip percentage at a restaurant has a mean value of 18% and a standard deviation of 2%.…

A: Given information: Given that the tip percentage at a restaurant has a mean value of 18% and a…

Q: A soft-drink machine is regulated so that it discharges an average of 200 milliliters per cup. If…

A:

Q: The average price of a kilogram of ham is 1,300. Assume that the standard deviation is 150. If a…

A: given  average =μ= 1300 standard deviation=σ= 150 random sample= n = 30

Q: A population of Gala apples has a mean m=0.40 lbs and a standard deviation s=0.16 lbs. How large a…

A: Solution: From the given information, m=0.40 and s=0.16

Q: Assume that blood pressure readings are normally distributed with a mean of 123 and a standard…

A:

Q: In a recent study, the Centers for disease Control and prevention reported that diastolic blood…

A:

Q: The average price of a kilogram of ham is P1,300. Assume that the standard deviation is P150. If a…

A:

Q: In a population of children at a local elementary school, the average number of sick days taken per…

A: To calculate the required probability we need to the score 7 in to z-score then we will use z-table…

Q: A sample of size 50 was drawn from a population that is not necessarily normally distributed. The…

A: GivenMean(μ)=10standard deviation(σ)=7sample size(n)=50

Q: A certain machine makes electrical resistors having a mean resistance of 50 Ohms and a standard…

A: Given,sample size(n)=49mean(μ)=50standard deviation(σ)=3

Q: Suppose that from the past experience a professor knows that the test score of a student taking his…

A: If a random variable X has a distribution with mean µ and standard deviation σ, then the Z-score is…

Q: The birth weight of human infants is normally distributed with a mean of 7.6 poundsand a standard…

A: Solution: Let X be the birth weight of human infants. From the given information, X follows normal…

Q: Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean…

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: If a random member (x) is selected from a normal distribution having a mean of 80 and standard…

A: According to the provided information,

Q: If all possible samples of size 16 are drawn from a normal population with mean equal to 50 and…

A:

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.