You Roll a Pair of Dice

Multiple Choice

You roll a pair of dice.If you get a sum greater than 10 you win $50.If you get a double you win $20.If you get a double and a sum greater than 10 you win a $70.Otherwise you win nothing.Find the standard deviation of the amount you win at this game.

A) $14.08
B) $274.31
C) $25.21
D) $14.91
E) $16.56