Merge pull request #1 from sujshah/patch-1

Update coin100flipsgamble.tex

Author: dwcoder

src/answers/coin100flipsgamble.tex

@@ -37,7 +37,7 @@
 \end{center}
 The probability of interest is $P(Y>60 = 0.025)$ and thus the expected value of the gamble is
 \[
-  \E(\text{Gamble}) = -1 + (10)(0.025) = 1 - 0.25 = -0.75
+  \E(\text{Gamble}) = -1 + (10)(0.025) = -1 + 0.25 = -0.75
   \text{.}
 \]
 On average you lose 75 pence for playing the game so it is not worthwhile.