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S=simpangan baku=2
Xi=nilai suatu data= 70
Xr=nilai rata rata=...?
jawab
Y= (Xi-Xr)/S
1,5= (70-Xr)/2
1,5×2=70-Xr
3=70-Xr
Xr=70-3
Xr=67
jadi nilai rata rata suatu kelas adalah B. 67