🏷️ LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION →
Log in
Statistics
3
answers
0
watching
130
views

A teacher has a class of 60 students taking the AP Statistics test. Assume that the average score of all students who took AP Statistics is 2.8 and the standard deviation is 1.3.

What is the probability that the average score of this teacher's class will be at least 3?

Watch
3
answers
0
watching
130
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share
Already have an account? Log in
Share
Priyanshu Patel
Priyanshu PatelLv10
8 Apr 2021
Already have an account? Log in
Share

Related textbook solutions

Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208

Related questions

The test scores in Jerry's online AP Statistics course and online AP U.S. History course can be approximated using the normal curve. Jerry is taking both online AP Statistics and online AP U.S. History.

He scored a 95 on an AP Statistics test where the mean score was 84 with a standard deviation of 4.5 He then scored a 90 on an AP U.S. History test with a mean score of 75 and a standard deviation of 8.2 on which test did he perform better relative to his peers. Explain your answer and show your work for full credit. (6 points)

 The test scores in Jerry's online Ap Statics course and online AP U.S. History course can be approximated using normal curve. Jerry is taking both online AP Statistics and online AP U.S. History. He scored a 95 on an AP Staticstic where the mean score was 84 with a standard deviation of 4.5 He then scored a 90 on an AP U.S. History thest with mean score of 75 and a standard deviation of 8.2. On which test did he perform better relative to his peers. Explain your answer and show your work for full credit.

(6 points).

1. Mr. Jones is interested in determining how long it takes his students to write essays for his class. 

The table below shows the mean and standard deviation for the length of time to write an essay (in minutes) for a random sample of 20 AP Statistics students and a random sample of 25 physics Honors students. (These are from all students he has had through the years)

Based on the histogram of the data, it is not unreasonable to assume the distribution of essay times is approx normal.

a. Estimate the mean difference in essay completion times for all AP Statistics and Physics Honors students In Mr. Jone's classes.

b. Based only on this confidence interval, do you think the difference in the mean wait times is statistically significant? Justify your answer.

 

Weekly leaderboard

Home
Homework Help 3,900,000
Statistics 10,000
Start filling in the gaps now
Log in