Question

The weight of trucks traveling on a particular section of I-475 has a population mean of...

The weight of trucks traveling on a particular section of I-475 has a population mean of 15.8 tons and a population standard deviation of 4.2 tons.

a-       What is the probability a state highway inspector could select a sample of 49 trucks and find the sample mean to be 14.3 tons or less?

b-       What is the probability a state highway inspector could select a sample of 64 trucks and find the sample mean to be 14.3 tons or more?

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
An inspector needs an estimate of the mean weight of trucks crossing a bridge. She selects...
An inspector needs an estimate of the mean weight of trucks crossing a bridge. She selects a random sample of 25 trucks and finds a mean of 16 tons with a sample standard deviation of 2 tons. find the 95 percent confidence interval for the population mean.
Trucks traveling on a certain highway have to stop and be weighed at a weigh station....
Trucks traveling on a certain highway have to stop and be weighed at a weigh station. The federal government drew a random sample of 150 trucks and measured their weights. The sample mean was 45,000 pounds. Assume the population standard deviation is 8,000 pounds. Calculate a 99% confidence interval for the true unknown mean weight of all trucks on the highway. Round to one decimal place. What is the margin of error for this estimate? Round to one decimal place....
Assume that a standard dumptruck owned by a highway department can transport 1.4 tons of dirt...
Assume that a standard dumptruck owned by a highway department can transport 1.4 tons of dirt per load (assume this is a population mean), with a population standard deviation of 0.28 tons. Suppose the highway department is concerned about some of their trucks not being able to haul as much as most, and in a sample of six trucks, they hauled an average of 1.11 tons of dirt. Assuming that the population is normally distributed, what is the probability that...
a population has mean 48.4 and standard deviation 6.3 (a) find the mean and standard deviation...
a population has mean 48.4 and standard deviation 6.3 (a) find the mean and standard deviation of x for sample of size 64. (b) find the probability that the mean of a sample of size 64 will be less than 46.7
assume that in a particular region, wild salmon have an average weight of 5 pounds with...
assume that in a particular region, wild salmon have an average weight of 5 pounds with a standard deviation of 1.6 pounds. a. Find the probability that a salmon's weight is between 4.1 pounds and 5.5 pounds. b. Find P80, the 80th percentile of salmon weights. c. Assume that a sample of 25 salmon is randomly taken from the preceding population and the mean of their weights recorded. Give the mean μx and the standard deviation σx of the sample...
Statistics Canada reports that the birth weight of newborn babies in Saskatchewan has a mean of...
Statistics Canada reports that the birth weight of newborn babies in Saskatchewan has a mean of 3.45 kg for both sexes. Suppose the standard deviation is 0.7 kg. Further we randomly sample 49 birth certifi- cates in Saskatchewan and record the birth weights of samples babies. Find the mean and standard deviation of the sampling distribution of x ̄. What is the probability that sample mean birth weight will be less than 3.25 kg?
A population has a mean of 50 and a standard deviation of 8. A sample of...
A population has a mean of 50 and a standard deviation of 8. A sample of 64 observations will be taken. The probability that the mean from that sample will be larger than 49 is a)0.1587 b)0.8413 c)0.0228 d)0.9772
1) Adult Golden Retrievers have a mean weight of 64 pounds with a standard deviation of...
1) Adult Golden Retrievers have a mean weight of 64 pounds with a standard deviation of 8 pounds. If you take a random sample of 50 adult Golden Retrievers, what would be the standard deviation of the sample distribution, σ¯¯¯XσX¯? 64 pounds 1.13 pounds 8 pounds 9.05 pounds 2) Adult Golden Retrievers have a mean weight of 64 pounds with a standard deviation of 8 pounds. If you take a random sample of 35 gold retrievers, what is the probability...
Crossett Trucking Company claims that the mean weight of its delivery trucks when they are fully...
Crossett Trucking Company claims that the mean weight of its delivery trucks when they are fully loaded is 5,800 pounds and the standard deviation is 270 pounds. Assume that the population follows the normal distribution. Fifty trucks are randomly selected and weighed. Within what limits will 90% of the sample means occur? (Round your z-value to 2 decimal places and final answers to 1 decimal place.) A. Sample means _____ to _____
Crossett Trucking Company claims that the mean weight of its delivery trucks when they are fully...
Crossett Trucking Company claims that the mean weight of its delivery trucks when they are fully loaded is 5,250 pounds and the standard deviation is 160 pounds. Assume that the population follows the normal distribution. Forty trucks are randomly selected and weighed. Within what limits will 95 percent of the sample means occur? (Round your z-value to 2 decimal places and final answers to 1 decimal place.)
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT