$4.$ Based on the following information, make an estimate of the stock's beta: Month $1=$ Stock $+1\mathrm{.}1\%,$ Market $+1\mathrm{.}5\%$; Month $2=$ Stock $+1\mathrm{.}4\%,$ Market $+2\mathrm{.}4\%$; Month $3=$ Stock $-2\mathrm{.}1\%,$ Market $-2\mathrm{.}9\%.$