Oblicz x, jeśli średnia ważona licz 3,8,x,15 z wagami odpowiednio 5,2,7,1 jest równa 4.
3*5+8*2+x*7+15*1
--------------------------- = 4
5+2+7+1
15+16+7x+15
----------------- = 4 / *15
15
15+16+7x+15=60
7x = 60 – 15 – 16 – 15
7x = 60 – 46
7x = 14 /: 7
X = 2
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3*5+8*2+x*7+15*1
--------------------------- = 4
5+2+7+1
15+16+7x+15
----------------- = 4 / *15
15
15+16+7x+15=60
7x = 60 – 15 – 16 – 15
7x = 60 – 46
7x = 14 /: 7
X = 2