You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- Thread starter Doom
- Start date

- Joined
- Oct 6, 2005

- Messages
- 10,811

Hello. Does your teacher expect you to solve those problems, or are you simply asking for help out of curiosity?my teacher … just said the expected value is a weighted mean. Then he gave us these examples but he doesn't explain anything about how to get the answers.

I think he may expect us to solve that. Most of us in the class have somewhat strong mathematical background from what he said, unfortunately I don't. XDHello. Does your teacher expect you to solve those problems, or are you simply asking for help out of curiosity?

- Joined
- Oct 30, 2021

- Messages
- 1,344

I think he may expect us to solve that. Most of us in the class have somewhat strong mathematical background from what he said, unfortunately I don't. XD

- Are you familiar with the definition of expected values of random variables with know probability distribution function (PDF)?
- Do you know how do compute expected value of a function of a random variable?
- How about random vectors? If you X and Y are independent with known PDFs do you know how to compute PDF for the vector (X,Y)?

1. Yes, I know the definition of expected values and PDF, I'm gonna review it.

- Are you familiar with the definition of expected values of random variables with know probability distribution function (PDF)?
- Do you know how do compute expected value of a function of a random variable?
- How about random vectors? If you X and Y are independent with known PDFs do you know how to compute PDF for the vector (X,Y)?

2. Yes, same as the 1st question

3. No, I can't handle many problems related to vectors yet.

I have studied integral calculus in my 1st year undergraduate course but it has been a long time ago. I need some time to review it.Have you studied integral calculus? If not, I greatly doubt you have the tools to handle this course.

- Joined
- Oct 30, 2021

- Messages
- 1,344

Instead of "vectors" Wikipedia describes "Densities associated with multiple variables", but they are talking about the same things, i.e. vectors whose coordinates are random variables. I've also found this lecture notes, which talk of random vectors.3. No, I can't handle many problems related to vectors yet.