Question 321023
{{{drawing(300,300,-5,75,-5,15,grid(1),
circle( 12,4,1.3 ),
circle(21,6,1.3),
circle(38,7,1.3),
circle(44,5,1.3),
circle(59,9,1.3),
circle(63,11,1.3),
circle(70,12,1.3),
graph(300,300,-5,75,-5,15,0))}}}
.
.
.
{{{ xave=43.85714 }}} 
{{{yave=7.714286}}} 
{{{SSXX=2850.857}}} 
{{{SSYY=55.42857}}} 
{{{SSXY=355.7143}}} 
b={{{SSXY/SSXX=0.125}}} 
b'={{{SSXY/SSYY=6.42}}} 
b*b'={{{r^2=0.801}}} 
{{{r=sqrt(r^2)=0.895}}} 
.
.
.
{{{y= 0.125x+2.24 }}}
.
.
.
{{{drawing(300,300,-5,75,-5,15,grid(1),
circle( 12,4,1.3 ),
circle(21,6,1.3),
circle(38,7,1.3),
circle(44,5,1.3),
circle(59,9,1.3),
circle(63,11,1.3),
circle(70,12,1.3),
graph(300,300,-5,75,-5,15,0.125x+2.24 ))}}}