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Posted by **Claudia** on Monday, January 16, 2012 at 6:03pm.

tosses, she will win $2. The game costs $5 to play. What is her mean expectation?

- Math -
**MathMate**, Monday, January 16, 2012 at 7:53pmAssuming Mary gets nothing from the other outcomes.

For 3 tosses,

outcome probability(P) return(E)

HHH 1/8 $16

HHT 1/8 $2

HTH 1/8 $2

THH 1/8 $2

Mean expectation

= Σ PE

= 16/8 + 3*2/8

= 2+6/8

= 2.75

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