what is the mathematical mean for all three investments as of dec 31 , 2017?
performance graph the following graph compares the total return , assuming reinvestment of dividends , on an investment in the company , based on performance of the company's common stock , with the total return of the standard & poor's 500 composite stock index and the dow jones united states travel and leisure index for a five year period by measuring the changes in common stock prices from december 31 , 2012 to december 31 , 2017. .

|  | 12/12 | 12/13 | 12/14 | 12/15 | 12/16 | 12/17 |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| Royal Caribbean Cruises Ltd. | 100.00 | 142.11 | 251.44 | 313.65 | 260.04 | 385.47 |
| S&P 500 | 100.00 | 132.39 | 150.51 | 152.59 | 170.84 | 208.14 |
| Dow Jones US Travel & Leisure | 100.00 | 145.48 | 169.28 | 179.27 | 192.85 | 238.77 |

the stock performance graph assumes for comparison that the value of the company's common stock and of each index was $ 100 on december 31 , 2012 and that all dividends were reinvested . past performance is not necessarily an indicator of future results. .

total_return_company = 385.47
total_return_index = 208.14
total_return_travel = 238.77
mean = (total_return_company + total_return_index + total_return_travel) / 3
answer = mean