A sample of 100 tyres is taken from a lot. The mean life of tyres is found to be 39, 350 kilo meters with a standard deviation of 3, 260. Could the sample come from a population with mean life of 40, 000 kilometers?

Q: A study finds that the carapace length of an adult spider is normally distributed with a mean of…

A:

Q: A company make LED light bulbs and claims that they have a life of 20,000 hours. A sample of 16bulbs…

A: From the given information, Sample size (n) = 16 Sample mean (x-bar) =19706 Standard deviation (s) =…

Q: Suppose the average amount of apples per tree in a large orchard is 600 pounds with a standard…

A: Given, Population mean µx=600 pounds Population standard deviation σx=70 pounds a. Assuming that the…

Q: A boxer would like to know the mean diameter of a navel orange. If the standard deviation is 0.3…

A: Given Standard deviations=0.3 Margin of error=0.1 At 95% confidence z=1.96

Q: The mean speed of a sample of vehicles along a stretch of highway is 67 miles per hour, with a…

A: From the provided information, Mean (µ) = 67 miles per hour Standard deviation (σ) = 2 miles per…

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: A trucking company determined that the distance traveled per truck per year is normally​…

A:

Q: A researcher wishes to estimate within $5 the average repair cost of for a refrigerator. If she…

A: Population standard deviation is 15.50. The z-critical value for 90% confidence interval is 1.645…

Q: Assume the annual day care cost per child is normally distributed with a mean of $7000 and a…

A: given: Mean=$7000 SD=$1500

Q: They select a random sample of 101 recent college graduates and find a sample mean hourly wage of…

A:

Q: If the mean height of bonsai trees is 52 cm with a standard deviation of 10 cm, 95% of the trees are…

A: NOTE : As per our guidelines we have to answer the first question if multiple questions are posted…

Q: Suppose the average golfer drives the ball around 225.55 yards with a standard deviation of 8.82.…

A: Assume that the random variable x denotes the distance of balls drove by the golfer.

Q: the mean weight of a group of boys is 145 lb, with a standard deviation of 4lb. if the weights are…

A:

Q: The length of time it takes a Grade 11 student to play the Candy Crush computer app follows a normal…

A: Given that  The length of time it takes a grade 11student to play the candy crush computer is…

Q: A livestock company reports that the mean weight of a group of young steers is 1142 pounds with a…

A: Let X be a random variable such that X: Weight of a young steer X~N1142, 792 a) The probability of…

Q: The mean speed of a sample of vehicles along a stretch of highway is 64 miles per​ hour, with a…

A: Given, μ=64σ=4P(52<X<76)=?

Q: The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 1500…

A:

Q: A trucking company determined that the distance traveled per truck per year is normally​…

A: Given information- Mean weight of the bears, µ = 80 thousand miles Population standard deviation, σ…

Q: when designing aircraft cabins, what ceiling height will alow 98% of men to stand without bumping…

A:

Q: If a sample of 144 male weights has a mean of 266 pounds and standard deviation of 32 pounds. The CV…

A: Given data Mean (x̅ ) = 266Standard deviation (s) = 32Coefficient of variation(CV) for sample is…

Q: Historically, heights of women have a bell-shaped with a mean of 162 cm and a standard deviation of…

A: Given that, Historically, heights of women have a bell-shaped with a mean of 162 cm and a standard…

Q: Nabisco claims that Chip Ahoy Cookies have an x=28.67 per cookie with a SD=2.67. Assuming this…

A: Here, the sample standard deviation is given as 2.67.

Q: The weight of oranges growing in an orchard is normally distributed with a mean weight of 6 oz. and…

A: It is given that the mean is 6 and the standard deviation is 1.5.

Q: An LED lightbulb manufacturer produces lights with a mean lifespan of 10,000 hours and a standard…

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

Q: The weights of oranges in a harvest are normally distributed, with a mean weight of 150 grams and…

A: From the provided information, Mean (µ) = 150 Standard deviation (σ) = 10 Let X be a random variable…

Q: The average number of moves a person make in his/her lifetime is 12 and the standard deviation is…

A: Given,sample size(n)=25mean(μ)=12standard deviation(σ)=3.5

Q: What is the standard deviation of a ribution that has a mean of 46.2 if a FORMANCE value of 28 is…

A: Given information: The mean of the distribution is µ = 46.2 The performance value is x = 28. The…

Q: A trucking company determined that the distance traveled per truck per year is normally distributed,…

A: A normal distribution is a continuous type probability distribution.It is also known as a…

Q: A population has a standard deviation of 18 on average how much difference should exist for a random…

A: A population has a standard deviation of 18.

Q: The adult eastern hellbender (a type of giant salamander) has a length which is normally distributed…

A:

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

A:

Q: Assume the annual day care cost per child is normally distributed with a mean of $7000 and a…

A: Given information: Given that the annual day care cost per child is normally distributed with mean m…

Q: the mean weight of a group of boys is 145 lb, with a standard deviation of 5lb. if the weights are…

A: We have to find correct answer..

Q: Assume the average amount of caffeine consumed daily by adults is normally distributed with a mean…

A: The detailed solution is as follows below:

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: A manufacturer of mugs packages them in boxes of 100. It is shown that, on the average, mugs weigh…

A: Mean 100 standard deviation 5 n  100 N 10000 Hypothesis testing involves large samples is…

Q: In order to determine the average weight of carry-on luggage by passengers in airplanes, a sample of…

A: 1.   From the given information, the sample size is 250.  The population standard deviation is 2.5.…

Q: An article reported that for a sample of 45 kitchens with gas cooking appliances monitored during a…

A: Confidence Interval - In interval estimation, confidence interval gives amount of error that can be…

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 livestock company reports that the mean weight of a group of young steers is 1172pounds with…

A: a) It is given that the mean weight of a group of young steers follows normal distribution with mean…

Q: Based from the record, the mean weight of the newborn babies is 4.8 lbs with a standard deviation of…

A: Given that  Population Mean=4.8  Standard deviation=0.75 Sample size=60

Q: Suppose there is a city where the mean cost per month of a one-bedroor apartment is $1,500, with a…

A: The percentage of one bedroom apartments in the city cost between $750 and $1000 is,

Q: If the standard deviation had been larger, the power would have been larger.

A: Here given data of two sample t test   Power of test = 0.752923

Q: m and 5.50 m. What is the standard deviation

A: Introduction: The Standard Deviation in descriptive statistics is the degree of dispersion or…

Q: The amount paid for a particular model car is normally distributed with a mean of $15,300 and a…

A:

Q: The mean salary of all employees in a company is $3,485, and the standard deviation is $1,870. Find…

A:

Q: In a survey of men aged 20-29 in a certain country, the mean height is 73.4 inches with a standard…

A: The random variable X is defined as the height of men aged 20-29 which follows normal distribution…

Q: In a survey of men aged 20-29 in a certain country, the mean height is 73.4 inches with a standard…

A: The provided information are : Consider, X be the random variable which represents the minimum…