A single share of stock in a company has a current price of 50. Suppose that there are only four possibilities for the stock's return over the course of the next year. These possibilities, along with the probability of each occurring, are provided in the table below. R -24% -5% 6% 28% P[R] 0.23 0.28 0.33 0.16 Find the stock's volatility. 18.29% 21.62% 16.63% 23.28% 19.96%