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Suppose you have a weighted coin in which heads comes up with probability 3/4 and tails with probability 1/4. If you flip heads, you win 2 dollars, but if you flip tails, you lose 1 dollar. What is the expected value of a coin flip? Express your answer as a decimal

 Oct 24, 2018
 #1
avatar+539 
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https://web2.0calc.com/questions/expected-value_5

 

You asked this question earlier today. I think Rom was helping you on this one.

 Oct 24, 2018
 #2
avatar+539 
+9

\(\text{let }P[\text{heads}] = p\\ E[V] = 2p -(1-p) = 3p-1\)

 

That's what Rom came up with...

 Oct 24, 2018
 #3
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Rom also came up with “i'm gonna assume you can plug p=3/4 in”

 

This site has a profanity filter, but it does not work very fucking well.

What the site needs is a stupidity filter. With just a half-assed stupidity filter, Rom’s assumption would have been correct!

 Oct 24, 2018

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