+0

# Hi guys, this question wasn't answered. ;)

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http://web2.0calc.com/questions/1-nbsp-two-numbers-x-and-y-are-randomly-chosen-from-the-interval-0-1-what-is-the-expected-value-of-x-y

Apr 19, 2015

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Apr 19, 2015

#1
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Alan Apr 19, 2015
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Oh right, this is only for the first. Thanks Alan:

Since we can add expected values of independent events, the expected value of the sum is the sum of the expected values of each.

Since we are just as likely to pick x as 1-x, the expected value of x (and likewise y) is equal to 1/2.

Therefore the expected value of the sum is 1/2+1/2=1.

Apr 19, 2015
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hi, I was the one that posted this. May you answer the other questions that came along with it please?

Apr 19, 2015
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Alan, could i please suggest that you answer these 'repost' questions on the original thread and then just make an note on the new thread that you have done so please.

That way the question and answers all stay together :)

Apr 20, 2015
#5
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Sorry Melody, will do!

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Apr 20, 2015
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Thanks Alan :)

Apr 21, 2015