Celceliska xisaabta waa qiime inta badan loo adeegsado tirakoobka, kaas oo loo xisaabinayo inuu yahay celceliska xisaabta ee qiyamka.
Haddii aan haysanno tiro ka mid ah
n
qiyamka. Aan u yeerno
x1, x2, …, xn.
Si aad u hesho celcelis ahaan, ku dar dhammaan
xi
natiijadana u qaybi
n.
¯x=x1+x2+...+xnn