What’s the mean annual return of the S&P 400 Midcap Index over the past 7 years? What’s the standard deviation? What’s the mean annual return of the NASDAQ-100 Index over the past 7 years? Calculate a...

What’s the mean annual return of the S&P 400 Midcap Index over the past 7 years?  What’s the standard deviation? What’s the mean annual return of the NASDAQ-100 Index over the past 7 years?  Calculate a coefficient of correlation of the two indexes’ returns.  Explain what may be causing the changes in the indexes’ returns over the past 7 years.