Question 1180016
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            For part  (a),  I have different analysis and different answer.



<pre>
Of every 9 games, you have one chance to win 15*6 = 90 dollars;


but you pay 15*9 = 135 dollars for 9 games.


Therefore, each game is worth  {{{(90-135)/9}}} = {{{-45/9}}} = -5 dollars for you.


In other words, playing this game once every week, you lose statistically 5 dollars per game, in average.
</pre>


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I wrote this post to convince the other tutor to change his original solution.