The volatility of changes in S&P futures mispricing relative to spot is estimated as 0.23% per day. On the other hand, the daily volatility of S&P spot index returns is 1.27%. What will be the hedging effectiveness (in percent) of S&P futures contracts in the short-term hedging of S&P spot exposure? Please give your answer to one decimal place. (The last expert said this question needs more info, but this what my professor gave us)