Сумма Х = 147,5. Х средний = 147,5/7 = 21,07. (Х средний)^2 = 443,9449.
Сумма У = 143. У средний = 143/7 = 20,43.
Х^2 = 121, 324, 361, 441, 506,25, 625, 961. Сумма Х^2 = 3339,25. Средний Х^2 = 3339,25/7 = 477,0357.
Х*У = 33, 126, 228, 399, 562,5, 950, 1209. Сумма Х*У = 3507,5. Средний Х*У = 3507,5/7 = 501,0714.
У = а + в*х. в = (501,0714 - 21,07*20,43)/(477,0357 - 443,9449) = (501,0714 - 430,4601)/33,0908 = 70,6113/33,0908 = 2,13.
а = усредний - в*хсредний = 20,43 - 2,13*21,07 = 20,43 - 44,8791 = -24,45.
У = -24,45 + 2,13х