Math
From Fallen London Wiki
The average gain per action is:
10*0.35 + 30*0.15 + 5*0.5
= 3.5 + 4.5 + 2.5
= 10.5 <a href="/wiki/Carnival_Ticket" title="Carnival Ticket"><img alt="" src="/w/images/thumb/1/1e/Ticket.png/20px-Ticket.png" decoding="async" width="20" height="26" srcset="/w/images/thumb/1/1e/Ticket.png/30px-Ticket.png 1.5x, /w/images/thumb/1/1e/Ticket.png/40px-Ticket.png 2x" /></a> <a href="/wiki/Carnival_Ticket" title="Carnival Ticket">Carnival Ticket</a>
