Calculate the Beta of a stock that has annual returns of $18\%,-10\%,16\%,$ while the market $($X$-$variable$)$ has corresponding annual returns of $20\%,-5\%,10\%$ during each of these three years. $($Hint: Your calculator should generate an average value of $8\%$ for the stock $=$ Y$,$ if not re$-$check your data register$).$