4 Th m b r, \(x , 6\) a certain ty sea sh ll was co ed at \(\theta\) rach ly cb en sites, each \(\mathbf { a }\) metre seq re, alg th co stlie in co ry \(A\). Th \(m \quad \mathbf { b } , y , \boldsymbol { 6 }\) th same \(\quad \mathbf { 6 }\) sea sh ll was co ed at \(\theta\) rach ly cb en sites, each \(\mathbf {} { } _ { \text {t } }\) metre sq re, alog th co stlie in co ry \(B\). Tb results are sm marised as fb lw s,w b re \(\bar { x }\) ad \(\bar { y } \mathbf { d } \mathbf { h }\) e th samp e meas \(\mathbf { 6 } x\) ad \(y\) resp ctiv ly. $$\bar { x } = 9 \quad \Sigma ( x - \bar { x } ) ^ { 2 } = \mathbf { 3 } \quad \bar { y } = \mathbf { 4 } \quad \Sigma ( y - \bar { y } ) ^ { 2 } = \text { 日 }$$ \includegraphics[max width=\textwidth, alt={}]{0df58f9d-6700-46cc-bcf0-903e94cccc02-06_58_1667_539_239} metre,it b co stlin sirc \(\mathbf { b }\) ry \(A\) ad inc \(\mathbf { b }\) ry \(B\).