Yes, it's unlikely all will finish unders but the predictions are simply based on most probable score.

My advice is if you want to use these expectancies to predict "Overs", use the Tot G column, and anything that is above 2.5 is a likely overs pick. So for example this week's likely overs games are:

• Liverpool vs Stoke (3.45)
• Crystal Palace vs Leicester (2.62)
• Southampton vs Bournemouth (2.51)
• West Ham vs Man City (3.15)
• Man United vs Arsenal (2.74)
• Tottenham vs Watford (3.00)

Hope that helps :).