Data 20,21,22,23,24,25,25 berapa rata ratanya

Mean = (20+21+22+23+24+25+25) / 7 = 160 / 7 = 22.85 

Rata2 (mean) = jumlah data : banyak data

mean = 20+21+22+23+24+25+25 : 7
= 160 : 7
= 22,86