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2 000 : 2 = 1000
1 000 : 28 = 35,72
Średnia = 35 zł 72 gr. = 3572 gr
17000/5=3400 zł
x-xśred
-400, -400, -400, -400, 1600
x-xśred do kwadratu
1600, 1600, 1600, 1600, 2560000
SUMA = 6656
s=√(6656/5)=√1331,2= 36,49 zł