The number of Facebook friends students at a univeristy have are Normally distributed with a mean of 1200 and a standard deviation of 200.  What percentage of students has AT LEAST 1000 Facebook friends?

Q: Suppose that the amount of time per day that American adults spend on their mobile devices is…

A: Let X denotes the amount of time (in minutes) per day that American adults spend on their mobile…

Q: One country’s annual rainfall has a normal distribution with mean of 100 inches and standard…

A:

Q: Female cougar weights are normally distributed with mean=102 pounds and standard deviation= 13…

A: Answer:-  Given that, μ=102, σ=13

Q: find an 80th percentile of the distribution of the average of 49 flyballs

A: Let M denote the average distance of fly balls for the sample of size n = 49.

Q: The number of orders received daily by an online vendor of used CDs is normally distributed with…

A: The provided information is  µ=210 σ=20 P(X≥246)…

Q: Harry’s commuting times to work have a normal distribution with a mean of 45 minutes and standard…

A: Given: μ = 45 minutes σ = 10 minutes   Formula Used: Z-score = X-μσ

Q: Assume the commute times for people iving in San Francisco are normally distributed with a mean of…

A: Given that  For San Francisco  Mean = 41 , Standard deviation = 8.2 For New York  Mean = 53 ,…

Q: The retirement age of National Football League (NFL) players is Normally distributed with a mean of…

A: Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

Q: The incubation time for Rhode Island Red chicks has a Normal distribution with a mean of 21 days and…

A: Here, mean is 21 and standard deviation is 1

Q: he retirement age of National Football League (NFL) players is Normally distributed with a mean of…

A:

Q: The weights of students in a large statistics class vary according to a normal distribution with…

A:

Q: For what lengths will a bolt be​ destroyed?

A: here given, mean = 7cm standard deviation = 0.10 cm

Q: What percentage of organs weighs less than 250 grams or more than 350 grams in a bell-shaped…

A: mean=μ=300, σ=sd=50X~N(300, 50)P(X<250or X>350)=?

Q: A survey was taken among the freshman at our college to find out how many hours a week they spent…

A: It is given that the mean and standard deviation are 30 and 10, respectively.

Q: Assuming that the heights of college women are normally distributed with mean 64 inches and standard…

A:

Q: The length of human pregnancies from conception to birth approximates a normal distribution with a…

A:

Q: Fluorescent lightbulbs have lifetimes that follow a normal distribution, with an average life of…

A: Solution: From the given information, σ=1,612 hours and n=332.

Q: determine the percent of batteries that can be expected to require repair or replacement under…

A: Let X be the random variable that breakdown times. Given that, X ~ N(μ=50, σ=6) The warranty on a…

Q: manufacturer is producing metal rods whose lengths are normally distributed with a mean of 65.0 cm…

A: Population Mean,μ = 65 Population Standard Deviation,σ = 0.3

Q: Happy Hair will hire only those hairdressers in the top 20 percent based on the amount of time it…

A: Given: Mean= μ== 67.5 Standard deviation= σ = 12.5

Q: The number of cell phone minutes per month used by a collage student follows a normal distribution…

A: To solve this problem, we first need to standardize the given values using the standard normal…

Q: The height of men is a normally distributed variable with a mean of 68 inches and a standard…

A: Mean(μ)=68Standard deviation(σ)=3

Q: The length of time it takes for a manufacturer to build a car is normally distributed with a mean of…

A:

Q: If the average wait time is 12 minutes with a standard deviation of 3 minutes, determine the…

A: Given : Average wait time =12 minutes Standard deviation =3 minutes We have to calculate percentage…

Q: 3. An analysis of the earnings of a group of engineers yielded the following results earnings (in…

A: Earnings and corresponding CDF is given , First convert cdf to pdf , For PDF , subtract previous CDF…

Q: Suppose the scores of students on an exam are normally distributed with a mean of 337 and a standard…

A: Let X be the random variable from normal distribution with mean (μ) = 337 and standard deviation (σ)…

Q: Suppose the weight of  "one-pound" packages of meat are normally distributed with a mean value of 1…

A: In this context, X denotes the weight. It is known that X follows a normal distribution with a mean…

Q: The population distribution of the useful lifetime of a cutting blade of a concrete saw has mean 50…

A: From the provided information, Population mean (µ) = 50 hours Standard deviation (σ) = 9 hours Let X…

Q: A random sample of 84 products is selected and sample mean and standart deviation are found to be…

A: We have to find level of confidence.

Q: The drive distance (in yards) for professional golfers is normally distributed with a mean of 308.04…

A: The normal distribution: A continuous random variable X is said to follow normal distribution with…

Q: The weights of students in a large statistics class vary according to a normal distribution with…

A:

Q: The time required for nurses to learn a particular task are found to be normally distributed with a…

A: Given information- Population mean, μ = 18.4 minutes Population standard deviation, σ = 2.7 minutes…

Q: The length of time for women’s high school volleyball games is normally distributed with a mean of…

A: Given Data Population Mean,μ = 53.0 Population Standard Deviation,σ = 6.0

Q: The weights of students in a large statistics class vary according to a normal distribution with…

A:

Q: Response time is an important statistic for measuring the effectiveness of a fire department, and is…

A: Given data,Mean μ=4.5sd σ=1.2P(4<X<6)=?

Q: 20% of drivers don't use turn signals, observed of 140 cars.  What is the standard deviation of…

A: Given that 20% of drivers don't turn signals and there are 140 cars. That is, p=0.20 and n=140

Q: hs of a particular animal's pregnancies are approximately normally distributed, with mean = 251 days…

A: Consider X be the random variable representing the time span of pregnancies.   X follows normal…

Q: The incubation time for Rhode Island Red chicks has a Normal distribution with a mean of 21 days and…

A: Here, mean is 21 and standard deviation is 1

Q: Using 1% level of significance, test if the population average is not 73.

A: A normally distributed standardized English test is known to have a mean score of 73 and a standard…

Q: · For 500 readers polled, how many people read in between 18 and 22 minutes a day? . For 25,000…

A:

Q: The number of calories consumed per day for a child is normally distributed with a mean of 1544 and…

A: The number of calories consumed per day for a child is normally distributed with a mean of 1544 and…