need help on these four problems!!

YA 7. An asset has an average return of 5 percent and a standard deviation of 10 percent. Which of the following statements is true? Its variance is 25. Its coefficient of variation is 2.0. If returns are normally distributed, 95 percent of the time its returns will fall between - 5 percent and 15 percent. If returns are normally distributed, 99 percent of the time its returns will fall between -15 percent and 25 percent. 8. The last three annual retums on an asset are 10 percent. -10 percent, and o percent. What is the standard deviation of the returns? cccc 9. A firm's sales dedine while it is locked into a suroker of fixed cost leases for equipment. What is this an example of? Purchasing power risk Business risk Price risk Financial risk BBCcc AaBbccDe AaBbcc Subtitle Subtle Em... Emphasis AaBbCcDAaBbCcDe AaBbCcDe AaBCCDI AABBCCO intense E... Strong Quote Intense Q... Subtle Ret. Styles 10. In recent years some U.S. firms have merged with non-U.S. firms and changed their home country from the United States to that of their merger partner. In such situations, the U.S. corporate tax rates were higher than those of the other country. Such mergers can be an example of firms trying to control what risk? o c o o Business risk Financial risk Purchasing power risk Tax risk