The Samp;P500 Index has an annual return of 11.5% and 18% volatility over the last 80 years. For small cap stocks, it has been 15.6% for return and...

The S&P500 Index has an annual return of 11.5% and 18% volatility over the last 80 years. For small cap stocks, it has been 15.6% for return and 21.2% for volatility. The average of the bond market index over the same period has return of 5.5% and 6.3% volatility.

What is the 30-year forecast of range of return for all 3 asset classes?

And what is unusual about the lower range for the stock market and the higher range for the bond market?