Question 731989
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A person randomly selects one of the six envelopes shown below. Each envelope contains a check 
that a person gets to keep. Determine the person's expectation if four envelopes contain a $1000 check 
and two envelopes contain a $5000 check.
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<pre>
   With probability {{{4/6}}} the person will get a $1000 check 

or with probability {{{2/6}}} the person will get a $5000 check .


So, the Math expectation is

    {{{(4/6)*1000}}} + {{{(2/6)*5000}}} = {{{(2/3)*1000}}} + {{{(1/3)*5000}}} = {{{(2*1000+5000)/3}}} = {{{7000/3}}} dollars.   <U>ANSWER</U>
</pre>

Solved.


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What is written in the post by @lynnlo is nonsense.


Simply ignore it.