It's been another rough week for the market, and few stocks have been spared. Shares of Cisco (Nasdaq: CSCO) have slipped more than 5%. Shares of Apple (Nasdaq: AAPL), Netflix (Nasdaq: NFLX), and Research In Motion (Nasdaq: RIMM) have slipped about 10%. And encouraging news from IBM (NYSE: IBM) last week gave way to disappointing news from Intel (Nasdaq: INTC) this week. So what's an investor to do? Does Cemex (NYSE: CX) have the right mix for a skittish market? In this installment of "Fool Video," Motley Fool senior analyst Bill Mann talks about riding the stock market roller coaster.