4 ms·11. The betting pool amongst meteorologists has 3:1 odds for rain.by contravariant 3y ago11. The betting pool amongst meteorologists has 3:1 odds for rain.idiocrat 3y ago4:1 I know what you did here. I am taking my Mg/K supplements to keep up my attention.NhanH 3y agoWhy is it 4:1 instead of 3:1? 3:1 means that you bet $1 four times on the 25%, lose money three times and make back $3 the last time.