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xi = 6,5+1,5 / 2
= 4 ------> fi = 2 ----> xi.fi = 4.2 = 8
xi = 11,5+6,5 / 2
= 9 ------> fi = x ------> xi.fi = 9.x = 9x
xi = 16,5+11,5 / 2
= 14 -----> fi = 8 ------> xi.fi = 14.8 =112
xi = 21,5+16,5 / 2
= 19 ---> fi = 4 ------> xi.fi = 19. 4 =76
xi = 26,5+21,5 / 2
= 24 ----> fi = 3 ----> xi.fi = 24. 3 = 72
Σxi.fi = 8 + 9x + 112 + 76 + 72
= 268 + 9x
n = 2+x+8+4+3
= 17+x
14 (17+x) = 268 +9x
14.17 + 14x = 268 + 9x
238 + 14 x = 268 +9x
14x - 9x = 268 - 238
5x = 30
x = 6