Question

Of all the weld failures in a certain assembly, 76% of them occur in the weld...

Of all the weld failures in a certain assembly, 76% of them occur in the weld metal itself, and the remaining 24% occur in the base metal. A sample of 20 weld failures is examined.

1. What is the probability that none of them are base metal failures?

2. Find the mean number of base metal failures. Round the answer to one decimal place.

3. Find the standard deviation of the number of base metal failures.

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A random sample of 13 students were asked how long it took them to complete a...
A random sample of 13 students were asked how long it took them to complete a certain exam. The mean length of time was 117.6 minutes, with a standard deviation of 69.2 minutes. Find the lower bound of the 90% confidence interval for the true mean length of time it would take for all students to complete the exam. Round to one decimal place (for example: 108.1). Write only a number as your answer. Do not write any units.
A random sample of 13 students were asked how long it took them to complete a...
A random sample of 13 students were asked how long it took them to complete a certain exam. The mean length of time was 107.3 minutes, with a standard deviation of 82.5 minutes. Find the lower bound of the 90% confidence interval for the true mean length of time it would take for all students to complete the exam. Round to one decimal place (for example: 108.1). Write only a number as your answer. Do not write any units.
In a certain year, 29% of all teenagers in the United States had checking accounts. Your...
In a certain year, 29% of all teenagers in the United States had checking accounts. Your bank, TeenChex Inc., is interested in targeting teenagers who do not already have a checking account. (a) If TeenChex selects a random sample of 2,000 teenagers, what number of teenagers without checking accounts can it expect to find? teenagers What is the standard deviation σ of this number? (Round the standard deviation to one decimal place.) σ =   (b) Fill in the missing quantities....
The mean of a population is 76 and the standard deviation is 13. The shape of...
The mean of a population is 76 and the standard deviation is 13. The shape of the population is unknown. Determine the probability of each of the following occurring from this population. a. A random sample of size 36 yielding a sample mean of 78 or more b. A random sample of size 120 yielding a sample mean of between 75 and 79 c. A random sample of size 219 yielding a sample mean of less than 76.7 (Round all...
A) Traffic speed is investigated at a certain section of freeway. Mean speed is 73mph. Sample...
A) Traffic speed is investigated at a certain section of freeway. Mean speed is 73mph. Sample standard deviation was 20 mph. There were 24 samples. A researcher claims the actual speed on that freeway is more than 76 mph. What would be the null hypothesis? B) What would be the alternative hypothesis? C) What kind of test are we looking at? D) Find the critical value
A student has the following assignment grades: 85, 92, 72, 69, 74, 96, 83, 76, 72,...
A student has the following assignment grades: 85, 92, 72, 69, 74, 96, 83, 76, 72, 97. Find the mean, mode, and the five-number summary. Round to one decimal Find the mean and the standard deviation of the following quiz scores: 21, 20, 23, 15, 16. Round to one decimal. 15,000 students take a national test. The results are normally distributed with a mean of 400 and a standard deviation of 120. Approximately how many students scored between 400 and...
Annual income: The mean annual income for people in a certain city (in thousands of dollars)...
Annual income: The mean annual income for people in a certain city (in thousands of dollars) is 43, with a standard deviation of 23. A pollster draws a sample of 91 people to interview. (a) What is the probability that the sample mean income is less than 40? Round the answer to at least four decimal places. The probability that the sample mean income is less than 40 is . Part 2 of 5 (b) What is the probability that...
Almost all medical schools in the United States require students to take the Medical College Admission...
Almost all medical schools in the United States require students to take the Medical College Admission Test (MCAT). To estimate the mean score ? of those who took the MCAT on your campus, you will obtain the scores of an SRS of students. The scores follow a Normal distribution, and from published information you know that the standard deviation is 6.5 . Suppose that (unknown to you) the mean score of those taking the MCAT on your campus is 24...
According to a social media​ blog, time spent on a certain social networking website has a...
According to a social media​ blog, time spent on a certain social networking website has a mean of 24 minutes per visit. Assume that time spent on the social networking site per visit is normally distributed and that the standard deviation is 7 minutes. a. If you select a random sample of 25 ​sessions, what is the probability that the sample mean is between 23.5 and 24.5 ​minutes? ​(Round to three decimal places as​ needed.) b. If you select a...
a random sample of 13 students were asked how long it took them to complete a...
a random sample of 13 students were asked how long it took them to complete a certain exam. The mean length of time was 122.1 minutes what the standard deviation of 66.6 minutes. Final lower bound of 90% confidence interval for the true mean length of time it would take for all students to complete the exam . Round to one decimal place
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT