$1.($a$)$ What is the Beta value of the stock market at all times? $($b$)$ A stock with a Beta of $2\mathrm{.}0$ would be expected to have its stock price change $$ by how much if the stock market increased by $10$ percent?$($c$)$ A stock with a Beta of $0\mathrm{.}5$ would be expected to have its stock price change $$ by how much if the stock market increased by $10$ percent?