8,918 Answered Questions for the topic statistics

Statistics

05/21/23

Normal distribution

Suppose that the duration of a particular type of criminal trial is known to be normally distributed with a mean of 25 days and a standard deviation of 6 days.72% of all of these types of trials... more
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Statistics

05/21/23

Normal Distribution
Terri Vogel, an amateur motorcycle racer, averages 129.71 seconds per 2.5 mile lap (in a 7 lap race) with a standard deviation of 2.28 seconds. The distribution of her race times is normally... more
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Statistics

05/20/23

Determine the area under the standard normal curve that lies between z = – 2.5 and z = – 2
Determine the area under the standard normal curve that lies betweenz = – 2.5 and z = – 2
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Statistics Algebra 2

05/19/23

Stats question about percentages
A class has 301 students and 52.5% of them are men how many men are in the class?
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Statistics Algebra 2

05/19/23

Stats question about percentages
A class has 301 students and 52.5% of them are men how many men are in the class?
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Statistics

05/19/23

Statistics: discrete probability and binomial distribution

70% of all students at a college still need to take another math class. If 45 students are randomly selected, find the probability that :a) At least 33 of them need to take another math classb)... more
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Statistics

05/19/23

Find Probability

Suppose 4-year-olds in a certain country average 2 hours a day unsupervised and that most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation... more
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Statistics

05/19/23

Find Percentile

The patient recovery time from a particular surgical procedure is normally distributed with a mean of 5.6 days and a standard deviation of 2.4 days.What is the 80th percentile for recovery times?... more
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Statistics

05/19/23

Standard Deviation
Terri Vogel, an amateur motorcycle racer, averages 129.71 seconds per 2.5 mile lap (in a 7 lap race) with a standard deviation of 2.28 seconds. The distribution of her race times is normally... more
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Statistics

05/19/23

find Probability

IQ is normally distributed with a mean of 100 and a standard deviation of 15. Suppose one individual is randomly chosen. Let X = IQ of an individual. Find the probability that the person has an IQ... more
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Statistics

05/19/23

Elem Statistics: discrete probability and binomial distribution

52% of all Americans are home owners. If 45 Americans are randomly selected, find the probability that: a) exactly 25 of them are home ownersb) at most 22 of them are home ownersc) at least 24 of... more
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Statistics

05/16/23

Find the confidence interval:
How heavy a load (pounds) is needed to pull apart pieces of Douglas fir 4 inches long and 1.5 inches square? Here are data from students doing a laboratory... more
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Statistics Math Probability

05/15/23

Probability question
A cash register contains 5 one-dollar bills, 6 five-dollar bills, and 4 ten-dollar bills. You take 3 random bills without replacement. What is the list of possible outcomes for the total sum of... more
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Statistics

05/15/23

Mean=0, sd=1, if P(-b<z<b)=0.8566.find b?
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Statistics Math Algebra 1 Algebra 2

05/14/23

Can someone help me with this math calculation problem please
Sean's exam grades:Exam 1- 74.29%Exam 2- 71.43%Exam 3- 65.71%Exam 4- 65.71%** Exams are worth 75% of Sean's grade, weighing the lowest score 50% relative to the other threeSean's Discussion grade... more
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05/14/23

Can someone help me with this math calculation problem please
Sean's exam grades:Exam 1- 74.29%Exam 2- 71.43%Exam 3- 65.71%Exam 4- 65.71%** Exams are worth 75% of Sean's grade, weighing the lowest score 50% relative to the other threeSean's Discussion grade... more
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Statistics Math Probability

05/13/23

(a) State the null and alternative hypotheses. Will this be a one-tailed or two-tailed test? (b) What is the standardized test statistic?
In golf, the more energy that is transferred from the club to the ball increases the potential distance of a shot. Something called the “coefficient of restitution” (COR) measures this energy... more
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Statistics

05/12/23

Statistics: Linear Regression

You wish to determine if there is a positive linear correlation between the age of a driver and the number of driver deaths. The following table represents the age of a driver and the number of... more
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Statistics

05/11/23

Statistics: Confidence Intervals

You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 70%. You would like to be 90% confident that your... more
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Statistics

05/10/23

Find probability

A school newspaper reporter decides to randomly survey 14 students to see if they will attend Tet festivities this year. Based on past years, she knows that 23% of students attend Tet festivities.... more
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Statistics

05/09/23

An insurance company knows that in the entire population of millions of homeowners...
An insurance company knows that in the entire population of millions of homeowners, the mean annual loss from fire is μ = $500 and standard deviation: σ = $2000. The distribution of losses is... more
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Statistics

05/09/23

A manufacturing company has a 2% defect rate and seven items are chosen at random. What is the probability that one will have a defect?
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Statistics

05/08/23

Probability Statistics
Among the 12 applicants for managerial positions at a chain of movie theaters, 8 are college graduates and 4 are high school graduates. If three of the applicants are randomly selected, a. Identify... more
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Statistics Probability

05/08/23

Urgent! Expected Value, total variance
The number of winter storms in a good year is a Poisson random variable with mean 3, whereas the number in a bad year is a Poisson random variable with mean 5. If next year will be a good year with... more
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Statistics

05/08/23

How many students should you sample?
The SAT scores are distributed with a mean of 1500 any standard deviation of 289. You’re interested in estimating the average SAT score a First your students at your college if you would like to... more
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