A study of the Physics and Astronomy department has found that 95% of the graduate students drink between 1 and 6.8 cups of coffee a day. If this coffee consumption follows normal distribution, what is the standard deviation of the sample?

Q: A pharmaceutical company claims that a drug is effective in treating 90% of people having severe…

A: Given that,The random variable follows binomial distribution,n=6p=90%=0.9,q=1-p, q= 0.1

Q: Of a large group of men 5 per cent are under 60 inches in height and 40 per cent are between 60 and…

A:

Q: In a certain city, the average 20- to 29-year old man is 72.5 inches tall, with a standard deviation…

A:

Q: If a sample has a mean of 100 and a standard deviation of 6, what is the value in the data set that…

A:

Q: Assume that the mathematics score on the SAT are normally distributed with a mean of 500 and a…

A: Given

Q: What is the standard deviation on the graph ?

A:

Q: The total cholesterol levels of a sample of men aged 35-44 are normally distributed with a mean of…

A: Given:μ=219 and σ=36.6Sample size = n = 247We have to find how many would you expect to have a total…

Q: If the average mid twenties male weighs 169lbs. and a weight of 150 is in the 31st. percentile, what…

A: We are given,Mean = μ = 169X = 150Percentile = 31st

Q: According to one pollster, 56% of children are afraid of the dark. Suppose that a sample of size 28…

A: The standard deviation id the sampling distribution of the sample proportion is represented as and…

Q: If the variance of a distribution is 16, the standard deviation is?

A: Solution: From the given information, the variance of a distribution is 16.

Q: The standard deviation of the certain distribution is 9, what is its variance?

A: Hello! As you have posted 2 different questions, we are answering the first question. In case you…

Q: In a random sample of 48 people, the mean body mass index (BMI) was 28.3 and the standard deviation…

A: Given that Random sample size(n) =48 Mean body mass index (x¯)=28.3 Sample standard deviation (s)…

Q: A researcher claims that the standard deviation of the number of deaths annually from typhoons in…

A:

Q: If the standard deviation of sample A  is 5 and the standard deviation of sample B  is 12, what is…

A:

Q: If the mean exam score of a class was 75%, with a standard deviation of 15%,what percent of students…

A: Given,mean(μ)=0.75standard deviation(σ)=0.15

Q: For a population with a standard deviation of 20, what is the zscore corresponding to a score that…

A: The population standard deviation is 20. The z-score corresponding to a score that is 5 points below…

Q: The credit card balances on 1,000 accounts at the Jefferson Valley Bank have a mean of $760 and a…

A: mean = 760 s = 120 n = 1000

Q: An instructor in a large lecture class found, at the end of the semester, that the total point…

A: The provided information is:

Q: The scores on a marketing exam were normally distributed with a mean of 67 and a standard deviation…

A: Given data normally distributed with mean (μ) =67, standard deviation (σ) =9.Let ‘X’ be a normal…

Q: If a golfer hit drives a golf ball with a mean of 180 yards and a standard deviation of 20 yards,…

A: We have given that  A golfer hit drives a golf ball with a mean of 180 yards and a standard…

Q: For a sample of 18 cars, you find the standard deviation of the price is 6150. What is the standard…

A: Given: Sample size=n=18,Standard deviation=σ=6150.

Q: For a distribution with a mean of 70, if the distribution had a standard deviation of 4, would a…

A: the PDF of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a…

Q: All the houses in Stanton county have a mean size of 1650 square feet with a standard deviation of…

A:

Q: The department has decided that all marks from introductory psychology courses should be reported…

A: Here For two different  Distribution Comparison we will Use Standardized statics (Z)..

Q: The percent fo Coloradans that own a Subaru is 56%. If you were to take a random sample of size 70,…

A: We have given that,  Let X be the random variable from binomial distribution with probability (p) =…

Q: Suppose that that the average BMI of the patients at Beth Israel Deaconness Medical Center is 30…

A:

Q: In a certain city, the average 20- to 29-year old man is 69.4 inches tall, with a standard deviation…

A: Given: For Man:      Avg = 69.4      SD = 3.2 For Women:       Avg = 64.3        SD = 3.9 Who is…

Q: Find the corresponding​ z-scores. Who is relatively​ taller, a​ 75-inch man or a​ 70-inch woman?…

A: *Answer:

Q: The students of a large university in Luzon were studied regarding their hours of sleep at night.…

A: As the distribution of the hours of sleep can be modeled as normal distribution with mean μ of 6.9…

Q: A recent study found that 69% of all adults over 50 wear sunglasses for driving. In a random sample…

A: Formula : Mean = np Standard Deviation  :

Q: A small centre has found that the number of jobs submitted per day to its computers has a…

A: The empirical rule for variables is as follows: 68% of all possible observations lie within one…

Q: If a population has a standard deviation σ , then the standard deviation of the mean of 100 randomly…

A:

Q: In a certain​ city, the average​ 20- to​ 29-year old man is 72.5 inches​ tall, with a standard…

A: z- score for a 75-inch man =  0.833 z- score for a​ 70-inch woman = 1.447

Q: According to a recent survey, the salaries of assistant professors have a mean of $41,750 and a…

A:

Q: A standardized test has a mean of 50 and a standard deviation of 4. Which of the following is the…

A: The normal distribution  in the center are generally denser and basically less denser at tails.…

Q: In the province of Iloilo,the set of recorded midday temperature readings for the month of February…

A: Given, 10.5% of recorded temperature readings were under 28°C, and that 33% were above 30°. The…

Q: according to police sources, a car with a certain protection system will be recovered 90% of the…

A: Given problem is a binomial distribution with:

Q: The hotel room rate in Miami, Florida is normally distributed with a mean of $286 per night. Assume…

A:

Q: A company selling a new MP3 player advertises that the player has a mean lifetime of 5 years. If you…

A:

Q: A firm’s marketing manager believes that total sales for next year will follow the normal…

A: Given information- Population mean, µ = $3200,000 Population standard deviation, σ = $250,000 We…

Q: In a certain​ city, the average​ 20- to​ 29-year old man is 72.5 inches​ tall, with a standard…

A: 72.5 3.1 75 64.3 3.8 70

Q: In a population of 100 male fruit flies, the mean abdomen length is 2.0 mm and the standard…

A: Given  μ=2 and σ=0.3 Use standardization as z=x-μσ

Q: The number of cell phone minutes used by staff of DIT at Bowie State University follows a normal…

A: We have, X= The number of cell phone minutes used by staff of DIT at Bowie State university. Mean=…

Q: An analyst found that the average amount of money in bank accounts at his/her bank is $2,000 with a…

A:

Q: A nurse is interested in the amount of time patients spend exercising per day. According to a recent…

A:

Q: If a normally distributed group of test scores have a mean of 70 and a standard deviation of 12,…

A: It is given that the mean is 70 and the standard deviation is 12.

Q: Interpret the ­z-score of 1.45 in terms of its relationship to standard deviation as well as the…

A: Solution: From the given information, z=1.45.

Q: If the foot length of women follows a normal distribution and 95% of women have a foot length…

A: Given data: If the foot length of women follows a normal distribution 95% of women have a foot…

Q: According to a recent survey, the salaries of assistant professors have a mean of $41,750 and a…

A:

Q: A recent newspaper article reported the results of a survey of well-educated suburban parents. The…

A: Given that 2-year-old children watching an average of 60 minutes of television each day watching an…