Question 357893
{{{drawing(300,300,-2,10,-5,95,
grid(1),
circle(0,91,0.2),
circle(1,89,0.2),
circle(2,84,0.2),
circle(3,76,0.2),
circle(4,67,0.2),
circle(5,49,0.2),
graph(300,300,-2,10,-5,95,0))}}}

.
.
.
{{{xave=2.5}}}
{{{yave=76}}}
{{{SSXX=17.5}}}
{{{SSYY=1268}}}
{{{SSXY=-142}}}
{{{b1=SSXY/SSXX=-8.114}}}
{{{b2=SSXY/SSYY=-0.112}}}
{{{highlight_green(r^2=b1*b2=0.909)}}}
{{{a=yave-b1*xave=96.286}}}
{{{highlight(y= 96.286-8.114(x))}}}
.
.
.
{{{x=2.5}}}
{{{y=96.286-8.114(2.5))}}}
{{{y=96.286-20.285}}}
{{{highlight(y=76)}}}
{{{drawing(300,300,-2,10,-5,95,
grid(1),
circle(0,91,0.2),
circle(1,89,0.2),
circle(2,84,0.2),
circle(3,76,0.2),
circle(4,67,0.2),
circle(5,49,0.2),
circle(2.5,76,0.2),
circle(2.5,76,0.1),
circle(2.5,76,0.05),
graph(300,300,-2,10,-5,95,96.286-8.114x  ))}}}