Exercise 1

# Exercise 1 - Megan Lawless Lecture 3 Section 3 1 b Tossing...

• Notes
• meglawless89
• 2

This preview shows pages 1–2. Sign up to view the full content.

Megan Lawless Lecture 3, Section 3 August 30, 2007 1. b) Tossing 100 coins 50 times, the number of coins that showed up heads was always in between 42 and 64. It was usually about 48-54, which is what someone would expect with 100 fair coins being tossed. 2. a) A Bernoulli trial is one question, each with a probability of success of .25 (one answer out of four is correct). There are 7 Bernoulli trials per experiment because there are 7 questions on the test. b) It is most likely that someone will get 1 question out of seven correct. c) Someone should expect to get about 1 question correct out of 7 if they guess randomly. It is somewhat likely that someone will get 2 or 3, and even less likely that someone will

This preview has intentionally blurred sections. Sign up to view the full version.

Megan Lawless Lecture 3, Section 3 August 30, 2007 get 0 or 4. It is very unlikely that anyone who guesses on 7 questions will get 6 questions correct, and nearly impossible to get all 7 correct.
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: This graph is similar to the first one we did; however, the first graph differed slightly because is was equally likely to be above the average number than below it. In this graph, with 1 being about average, it is relatively likely to get a 2 or 3, but very unlikely to get a 5 or 6. The first graph has more of a normal parabolic shape, while this graph steeply increases and then declines in probability. It is much more likely to do worse than 3 correct than to get a 3 or 4. There is a small chance (about 1 in 4) of getting a respectable grade (3 or 4) by guessing. Personally, I would rather study. d) With a 50 question test, the graph above shows that a score between 10 and 15 right would be the average for someone who guesses on all of them. It seems to be nearly impossible to get more than half right, yet it is still likely to get very few correct....
View Full Document

• Spring '08
• STAFF
• Probability theory, Coin flipping, Megan Lawless

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern