Question 628167
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Hi,
Miles Traveled, x: 2,  3,10,7, 8, 15,3, 1, 11  mean = 6.67 
         Sales, y: 31,33,78,62,65,61,48,55,120 mean = 61.4
Re:   www.alcula.com/calculators/statistics/linear-regression/
Regression line equation: {{{y = ax+b}}} 
a ={{{(sum(x[i]y[1] - n*m[x]m[y], 1=1, n ))/(sum(x[i]^2 - n*m[x]^2, 1=1, n ))}}}   and {{{b = m[y] -  a*m[x]}}} 
y = 3.53x + 37.9
 when x = 8   &#8658; y = 66.15
 when x = 11  &#8658; y = 76.74