The duration of gestation in healthy humans is approximately normally distributed with a mean of 280 days and a standard deviation of 10 days. A certain obstetrician has 200 "expecting" patients. How many should he expect to give birth in less than 265 days ?

Q: The heights of adult men in America are normally distributed, with a mean of 69.2 inches and a…

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Q: . What is the probability that the student will get into a college whose entrance score is 550?

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Q: A significant number of students completed a Statistics exam, and the final marks had a mean of 70…

A: Answer - A significant number of students completed a Statistics exam, and the final marks had a…

Q: The heights of adult men in America are normally distributed, with a mean of 69.8 inches and a…

A: Provided information:Mean (men)=69.8Standard deviation (men)=2.69and,Mean (women)=64.7Standard…

Q: Assume that among the members of a men's gym, the distribution of body weights has a mean of 188…

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Q: The incomes of trainees at a local mill are normally distributed with a mean of $1100 and a standard…

A: The provided information are: Population mean (µ) = 1100 Population standard deviation (σ) = 150…

Q: A livestock company reports that the mean weight of a group of young steers is 1154 pounds with a…

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: The life of a battery is normally distributed with mean 70 hours with a standard deviation of 10…

A: Given, μ = 70 σ = 10 Z = X-μσ

Q: A large number of applicants for admission to graduate study in business are given an aptitude test.…

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Q: A set of test papers is normally distributed with a standard deviation of 5. If Riley scored an 83…

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Q: In an agricultural study, the average amount of corn yield is normally distributed with a mean of…

A: Given :- In an agricultural study, the average amount of corn yield is normally distributed with a…

Q: The lengths of human pregnancies are normally distributed with a mean of 268 days, and a standard…

A: Given that, X~N(268,152) n=10

Q: If on an average 8 ships out of 10 arrive safely at a port, find the mean and standard deviation of…

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Q: If a one-person household spends an average of $62 per week on groceries, find the maximum and…

A: GivenMean(μ)=62standard deviation(σ)=10

Q: On a final examination in Biology, the mean was 75 and the standard deviation was 12. What is the…

A: Given problem Given that   On a final examination in Biology,  The mean was = μ = 75 The standard…

Q: A statistics professor announces that 15% of the grades he gives are As. The results of the final…

A: It is given that the mean and standard deviation are 83 and 6, respectively.

Q: In 2019, the amount of money that motorists spent on gas had a normal distribution with a mean of…

A: Given Information Number of persons sampled (n) = 2400 Mean (µ) = 900 Standard deviation(σ) = 100…

Q: A livestock company reports that the mean weight of a group of young steers is 1300 pounds with a…

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

Q: the length of a certain species of fish were found to be normally distributed. the mean length is 72…

A: Any assumption about the parameter or probability function is called a hypothesis. Given data are…

Q: The gestation period for human births can be taken as normally distributed with a mean of 266 days…

A: Given:

Q: A study of the Physics and Astronomy department has found that 95% of the graduate students drink…

A: Explanation:Here given the two means and find out the standard deviation of the sample follows the…

Q: The average number of dropouts for a school district has been 305 per year, with a standard…

A: Mean = 305 s = 50

Q: The mean life of a battery is 55 hours with a standard deviation of 6 hours. The manufacturer…

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Q: When Lauren runs the 400 meter dash, her finishing times are normally distributed with a mean of 88…

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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: In general, the larger the animal the longer the length of pregnancy. For the horse, for example,…

A: A z-score represents the position of a data point in terms of its distance from the mean when…

Q: A livestock company reports that the mean weight of a group of young steers is 1150 pounds with a…

A: μ=1150σ=87  =P1050<x<1250

Q: The heights of adult men in America are normally distributed, with a mean of 69.1 inches and a…

A: GivenFor heights of adult menMean(μ)=69.1 inchesstandard deviation(σ)=2.66 inchesFor heights of…

Q: 21 year old men rates at rest are normally distributed with a mean of 70 beats per minute, and a…

A: Given that   21 year old men rates at rest are normally distributed Mean (μ)=70 beats per minute…

Q: The typical college freshman spends an average of ?=150 minutes per day, with a standard deviation…

A: Solution: Let X be the time on social media. From the given information, X follows normal…

Q: The numbers of books checked out daily at a local library are normally distributed with a mean of…

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Q: A set of data items is normally distributed with a mean of 60. Convert the data item of 55 to a…

A: Given that: Mean = 60Standard deviation = 5Data item = 55

Q: The weights of miniature horses are roughly normally distributed with a mean of 230 pounds and…

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Q: A maths class has 100 members. If there is a 15% absentee rate per class meeting , find the standard…

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Q: A manufacturer of calculator batrries claims that the mean length of life for its battry is 500…

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Q: In a particular city, the weight of newly born babies is normally distributed with a standard…

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Q: A livestock company reports that the mean weight of a group of young steers is 1180 pounds with a…

A: GivenMean(μ)=1180standard deviation(σ)=90

Q: A livestock company reports that the mean weight of a group of young steers is 1130 pounds with a…

A:

Q: Brooklyn earned a score of 850 on Exam A that had a mean of 550 and a standard deviation of 100. She…

A: Here we are to assume that scores on each exam are normally distributed.   For exam A, Brooklyn…

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

A:

Q: The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation…

A: Given,sample size (n)=50sample mean(μ)=268standard deviation (σ)=15

Q: The average wage for bank managers in a certain city is $91,900 per hour with a standard deviation…

A: Given that  X~N( μ = 91900 , ? = 24300) μ = 91900 , ? = 24300 Z-score =( x - μ )/?

Q: A desktop PC uses 120 watts of electricity per hour based on 4 hours of use per day. Assume the…

A: Given that mu = 120 , s.d = 6,n=500 p(x<106 ) =?  approximately how many will use less than 106…

Q: The heights of adult men in America are normally distributed, with a mean of 69.1 inches and a…

A: a) The man is 6 feet 3 inch tall 6 feet 3 inch = 6(12) + 3                      = 72 + 3 6 feet 3…

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

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Q: The heights of adult men in America are normally distributed, with a mean of 69.6 inches and a…

A: 69.6 2.66 64.2 2.56

Q: If the weight of fertilizer in a 40-pound bag is normally distributed with a standard deviation of…

A: Define  the Random Variable, X : Weight of fertilizer in the bag. X ~ N(40,0.52) Hence , the mean, µ…

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

A:

Q: A statistics professor announces that 15% of the grades he gives are As.  The results of the final…

A: Solution:From the given information, mean score is 83, standard deviation is 6. The fifteen…