# ProbabilityWatch

Announcements
#1
Having some difficulty with this question, would like some help:

Let X1 and X2 be independent random variables. X1 has expectation 3 and variance 1. X2 has expectation 1 and variance 2. How do I find the prob. that both X1 and X2 will be greater than 2?

Thanks
0
1 month ago
#2
(Original post by SS__)
Having some difficulty with this question, would like some help:

Let X1 and X2 be independent random variables. X1 has expectation 3 and variance 1. X2 has expectation 1 and variance 2. How do I find the prob. that both X1 and X2 will be greater than 2?

Thanks
Independent means you'll multiply the individual probabilities to get the joint.
0
#3
(Original post by mqb2766)
Independent means you'll multiply the individual probabilities to get the joint.
So would I just find P(X>2) for both X1 and X2 and multiply together?
0
1 month ago
#4
(Original post by SS__)
So would I just find P(X>2) for both X1 and X2 and multiply together?
Yes
0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### University open days

• SOAS University of London
Development Studies, Interdisciplinary Studies, Anthropology and Sociology, Languages, Cultures and Linguistics, Arts, Economics, Law, History, Religions and Philosophies, Politics and International Studies, Finance and Management, East Asian Languages & Cultures Postgraduate
Sat, 25 Jan '20
• University of Huddersfield
Sat, 25 Jan '20
• The University of Law
Solicitor Series: Assessing Trainee Skills – LPC, GDL and MA Law - Guildford campus Postgraduate
Wed, 29 Jan '20

### Poll

Join the discussion

0 (65)
27.31%
1 (39)
16.39%
2 (40)
16.81%
3 (32)
13.45%
4 (16)
6.72%
5 (20)
8.4%
6 (6)
2.52%
7+ (20)
8.4%

View All
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.