Fill in the missing words: Risk is usually measured by the variance of returns or the _____, which is simply the square root of the variance. As long as the stock price changes are not perfectly...

Fill in the missing words:

Risk is usually measured by the variance of returns or the _____, which is simply the square root of the variance. As long as the stock price changes are not perfectly _____,the risk of a diversified portfolio is _____ than the average risk of the individual stocks. The risk that can be eliminated by diversification is known as _____ risk. But diversification cannot remove all risk; the risk that it cannot eliminate is known as _____ risk.