Assuming a normal distribution, for a sample with M-40 and s=4, about 95% of the individuals will have scores between_ and

Q: A math test has a normal distribution with an average of 100 and a standard deviation of 12. What is…

A: Given information Population mean µ = 100 Standard deviation σ = 12 We have to find the probability…

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.47 and a…

A: Empirical rule: The probability that the observation under the normal curve lies within 1 standard…

Q: Suppose 1% of students drink more than 3 cups of coffee each day. To check this claim, a researcher…

A: Given that p = 0.01 ,n=133 What is the sampling distribution of the sample proportion? What is the…

Q: If the standard deviation of all 25 randomly selected samples from a normally distributed population…

A: We hvae  to find sample mean and population variance..

Q: the results of nationwide aptitude test in mathematics are normally distributed with mean = 253 and…

A: Given : The results of nationwide aptitude test in mathematics are normally distributed with Mean…

Q: The number of crackers in a box of Crackerbox Crackers is normally distributed with a mean of 75 and…

A: The provided information is  µ=75 σ=2 P(X>76) P(X>76)=P(X-µσ>76-752)=P(z>0.5)=0.3085The…

Q: The average time taken for your Internet service provider to remotely resolve a trouble ticket has a…

A: It is provided that,Mean (µ) = 4.343Standard deviation (σ) = 3.131.

Q: Suppose the length of time an iPad battery lasts can be modeled by a normal distribution with mean…

A: Mean = 8.2 Standard deviation = 1.2 Sample size = 16

Q: A normal distribution is observed from the number of rentals per week for a certain car rental…

A:

Q: Suppose that we randomly select a sample of 80 measurements from an infinite population having a…

A: 1) Given: Mean μ=30 Standard deviation σ=5 Sample size n=80

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.11 and a…

A: Given that the shoe sizes of American women have a bell-shaped distribution with a mean of 8.11 and…

Q: Among health care workers at a local hospital, the average number of vacation days taken per year is…

A: The mean is 5 and the standard deviation is 2.5.

Q: Suppose that prices of women’s athletic shoes have a mean of $75. and a standard deviation of…

A: Given information- Mean, μ = $75 Standard deviation, σ = $17.89 Sample size, n = 50 We have to…

Q: The mid-term exam scores in a statistics class were normally distributed with a mean of 70 and…

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: Suppose that blood chlorine concentration (mmol/L) has a normal distribution with mean=98 and…

A: Given that blood chlorine concentration has a normal distribution with, Mean = 98 Standard deviation…

Q: The salaries of employees at XYZ Corporation follow a normal distribution with mean £60,000 and…

A: Note: this probability value calculated from standard normal distribution table.

Q: Suppose the length of time an iPad battery lasts can be modeled by a normal distribution with mean…

A: 1. The probability that randomly selected ipad lasts longer than 10 hours is obtained below: From…

Q: The average time taken for your Internet service provider to remotely resolve a trouble ticket has a…

A:

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

A:

Q: A normal distribution has a mean 80 and standard deviation is 10. What is the probability of…

A: Given:    µ = 80     σ = 10

Q: Suppose that the height of women in Dakar, Senegal is normally distributed with mean 58 inches and…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: In the United States, men’s heights have mean of 69 inches, and standard deviation of 3 inches.…

A: Let X be the height of men in United States. X follows normal distribution that has mean µ = 69 and…

Q: The normal model applies to the productivity of all workers at a factory, with a mean of 75 units…

A:

Q: What is the median of a normally distributed random variable with mean ? and standard deviation ??

A: Normal distribution, also known as the Gaussian distribution, is a probability distribution that is…

Q: The standard deviation of a normal distribution is 20. What is the standard error of the mean…

A: from the given information,standard deviation(σ) =20.Sample size(n) = 225.

Q: Suppose that blood chlorine concentration (mmol/L) has a normal distribution with mean=98 and…

A:

Q: Suppose the longevity of iPad batteries can be modeled by a normal distribution with mean µ = 8.2…

A: Solution: Let X be the longevity of iPad battery. From the given information, X follows normal…

Q: Suppose the average age of a Tulane undergraduate is 20 years with a standard deviation of 1.2…

A:

Q: If 200 scores a taken at random from a normal distribution with mean 70 and standard deviation 5,…

A: From the given information,  the value of mean is 70, standard deviation is 5 and sample size (n) is…

Q: Suppose the lengths of the pregnancies of a certain animal are approximately normally distributed…

A: From the given information,Mean (μ) =272days and standard deviation (σ) =19daysSample size (n) =51

Q: What is the standard deviation of the distribution of means for samples of size 2?

A: Introduction:The standard deviation of the distribution of means in called the standard error of…

Q: University students' blood pressure can be expected to follow a normal distribution with a mean of…

A: Given data,μ=85σ=20If n=4P(X<90)=?

Q: The scores of students on the SAT college entrance examinations at a certain high school had a…

A:

Q: If a distribution is normal with mean 8 and standard deviation 2, then the median is also 8.…

A: Given,mean(μ)=8standard deviation(σ)=2and the distribution is normal

Q: if a distribution is normal, then it is not possible to randomly select a value that is more than 4…

A: It is given that the distribution is normal.

Q: What is the probability that a randomly chosen student has a height of more than 188.3 cm?

A: Let, X = height of male student  X follows Normal distribution with mean 174.5 cm and standard…

Q: Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed…

A: let X be the distance of fly balls hit to the outfield X~N(mu=260,sigma^2=50^2) n=49 we want to find…

Q: Assume that the average weight of an NFL player is 245.7 lbs with a standard deviation of 34.5 lbs.…

A: It is given that the mean is 245.7, the standard deviation is 34.5 and the sample size is 32.

Q: Assume the random variable X is normally distributed with mean 50 and standard deviation of 7.  What…

A:

Q: The admission committee of AUCA enrolls 76% of those who took the exam. If the scores follow a…

A:

Q: Suppose that the average number of hurricanes is 32 per year with a standard deviation of 2.8 and…

A:

Q: In a job fair, 3000 applicants applied for a job. Their mean age was formed to be 28 with a standard…

A: The standard normal curve is plotted where mean is in the center and there are two lines on each…

Q: consider the marks of all 1st year students on a statistics test. if the marks have a normal…

A: Let X be a continuous random variable of marks of all 1st year students on a statistics test is…

Q: If the mode of a normal distribution is 100 with variance equals 4, then the mean equals----

A: According to the provided informtion, mode = 100 variance =4

Q: The height of women in the United States is normally distributed with a mean of 165 cm and standard…

A: The normal distribution has curve with bell shape and it is symmetric about the mean. The normal…

Q: Normal Dist

A: Let the random variable X denotes the age at death. Given that X has a distribution with μ=70 years…

Q: What percentage of teenagers sleep less than 9 hours?

A:

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…