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April 30, 2024, 01:15:28 am
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Author Topic: discrete random variable problem  (Read 1020 times)  Share 

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gabrielle__

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discrete random variable problem
« on: September 24, 2008, 03:10:04 pm »
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A fair die is rolled twice and the sum of the number showing on the two faces are recorded

What is the probability that the sum of the two numbers is at least eight.
I just can't get the same answer as the back of the book.
What do you all get?
xoxo
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bucket

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Re: discrete random variable problem
« Reply #1 on: September 24, 2008, 03:16:06 pm »
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just draw out a table of all the combinations, count all the ones which have a sum that is 8 and then put it over 36


« Last Edit: September 24, 2008, 03:26:35 pm by bucket »
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gabrielle__

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Re: discrete random variable problem
« Reply #2 on: September 24, 2008, 03:17:04 pm »
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don't even worry.
I AM THE DUMBEST PERSON LOL!

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gabrielle__

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Re: discrete random variable problem
« Reply #3 on: September 24, 2008, 03:25:48 pm »
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no wait, worry!
I'm so behind with probability.
HOW THE HELL DO YOU WORK OUT (A intersection B)
in my text book it says use the "addition rule"
But doesn't say what the addition rule is.
????????????????????????????????????????????????? :( i hate life.
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ENTER: 91.5

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Glockmeister

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Re: discrete random variable problem
« Reply #4 on: September 24, 2008, 03:29:19 pm »
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I think the addition rule refers to this
« Last Edit: September 24, 2008, 03:31:08 pm by Glockmeister »
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gabrielle__

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Re: discrete random variable problem
« Reply #5 on: September 24, 2008, 03:34:38 pm »
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i figured it out.
:)
haha thanks anyway guys.
don't run away though.
give me another 10minutes and i'm sure there will be another stupid question on here.

speaking of, other day at the MAV lecture, the lecturererererer was differentiating.
and me being tired and blonde and so so doooopey, asked
" isn't they're meant to be a plus C on the end? "

I am just the worst kind of person.
(N)
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fredrick

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Re: discrete random variable problem
« Reply #6 on: September 24, 2008, 04:09:04 pm »
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L0L
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I will be tutoring Specialist/Methods in 2009. PM me if interested!

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