Math Is Fun Forum

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Expectation #1

C wrote:

I have 3 random variables X,Y and Z, independent and each from the standard normal distribution N(0,1) what is the

A says) √2

B says) That is not even close...

C says) Darn good answer A, I am going to use it with your permission of course.

A says) Pay no attention to B, use it all you want.

D says) A is a swell guy and my hero.

E says) A makes me nauseous. His answer is totally wrong.

What is the right answer?

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

ElainaVW

Member

Registered: 2013-04-29

Posts: 580

Re: Expectation #1

hello

Last edited by ElainaVW (2014-05-02 00:39:20)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Expectation #1

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

ElainaVW

Member

Registered: 2013-04-29

Posts: 580

Re: Expectation #1

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Expectation #1

Hi;

Yes, it is exactly what I have always strived for but fell short of, the perfect synthesis of hand methods and computer ones.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

ElainaVW

Member

Registered: 2013-04-29

Posts: 580

Re: Expectation #1

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Expectation #1

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.