In order to replace a battery in a complicated machine, one must go through about 30 different steps some of which involve very different kinds of tasks. The mean time to do this is 20 minutes with a standard deviation of 4 minutes. If a random sample of 10 battery replacement times is drawn, what is the probability that the average time for the sample will be more than 21 minutes?

Q: Suppose the scores on a statistics exam follow a normal distribution with a mean of 70 and a…

A: GivenMean(μ)=70standard deviation(σ)=10

Q: It currently takes users a mean of 13 minutes to install the most popular computer program made by…

A: Population mean = ? = 13 Sample S.D = s =2.7 Sample size = n =37 Sample mean = x̅ = 12

Q: The average score on the SAT is 1020, with a standard deviation of 180. If you take a random sample…

A: We have given that Mean(µ) = 1020 Standard deviation(σ) = 180 Sample size (n) = 50

Q: A recent study found the average life expectancy of a person living in Africa is 53 years with a…

A: The objective of this question is to find the probability that a randomly selected person in Africa…

Q: Suppose the scores, on a college entrance examination are normally distributed with a mean of 1000…

A: We have given that Suppose the scores, on a college entrance examination are normally distributed…

Q: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 3 years,…

A: Central Limit Theorem for mean: If a random sample of size n is taken from a population having mean…

Q: Tom works for a fruit company and found that the weight of pineapples are normally distributed with…

A: From the information, mean is 500 and standard deviation is 100.

Q: The weight of a certain type of dog is normally distributed with a mean of 34.7 pounds, and standard…

A:

Q: according to the government data the probability that a woman between the age of 25 and 29 was never…

A: Given, Probability that a women between the ages of 25 and 29 was never marries is 40%. i.e. p =…

Q: The average number of pounds of red meat a person consumes each year is 196 with a standard…

A: We are given,μ = 196σ = 22n = 60

Q: In a population of heroin users, the mean duration of heroin abuse is 5 years with a standard…

A: From the provided information, Mean (µ) = 5 years Standard deviation (σ) = 3 years X~N (5, 3) Sample…

Q: The weights of cans of Ocean brand tuna are supposed to have a net weight of 6 ounces. The…

A: Let x represent the weights of cans of ocean brand tuna follow normal distribution with means 5.99…

Q: Tom works for a fruit company and found that the weights of pineapples are normally distributed with…

A:

Q: Dr. Brown wants to conduct a study on 144 college age student who drink at a local bar in town. The…

A: Sampling Distribution of a Normal Variable : Given a random variable X. Suppose that the population…

Q: A population has a mean of 75 and a standard deviation of 15 you randomly sample nine people from…

A: Given population have mean 75 and standard deviation 15. A sample of 9 people from the population is…

Q: The scores in an intelligent test (IQ test) are known to be normally distributed with a  mean of 100…

A: Let X be the score of an IQ test.Given that, X is known to be normally distributed with a mean of…

Q: local fast-food joint reports that they sell a mean of 225.0 burgers per day with a standard…

A: We have given that  Population mean = 225 Standard deviation = 12.3 Sample size = 31

Q: Too much cholesterol in the blood increases the risk of heart disease. The cholesterol levels of…

A: We have to find given probability.

Q: The critical value used in constructing a 95% confidence interval is ________.   Question 16…

A: It is given that  Sample mean = 6 Sample standard deviation = 2 Sample size = 8 Confidence interval…

Q: Nintendo is doing a classical game competition for the anniversary of Super Maria bros. The average…

A:

Q: A population is normally distributed and has a mean of 50 and a standard deviation of 5 If we…

A: As we know the empirical rule of 68 - 95 - 99.7 that is the percent value that are one, two or three…

Q: The time taken in the cycling phase of a triathlon has a mean 23.16min and standard deviation…

A: The objective of this question is to find the probability that the mean cycling time taken by a…

Q: The average number of miles driven each day by a group of drivers is 20.7 miles with a standard…

A: μ = 20.7 σ = 6.5 N = 50 P ( 19.4 < x̅  < ( 22.5 ) = ?

Q: The time taken in the cycling phase of a triathlon has a mean 23.16min and standard deviation…

A: The objective of this question is to find the probability that the mean cycling time taken by a…

Q: ge 5 of 5 5. Assume the random variable X is normally distributed with a mean of 22 and standard…

A: Given Mean=22 Standard deviation=4.5

Q: A recent study was conducted and it found that IQ's are normally distributed with a mean or 100 and…

A: Given information, μ=100σ=15

Q: The average amount of sleep students get a night is normally distributed with a mean of 6.5 hours…

A: Normal distribution is also known as the Gaussian distribution . It is widely used in statistics .

Q: Question 17 options:   1)  3.52 to 8.47   2)  4.69 to 7.31   3)  4.66 to 7.34   4)  4.33 to…

A:

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.