Dell vostro

I went to check out notebooks and the sales try to sell me the dell vostro (14", i5-5200u, gt820m, 4g ram, 500gb). The label said 1.63 kg but the sales said its actually 1.5kg. I went on dell website but its still saying the machine is 1.63kg. Is the sales lying or is it really a new model that the official website has yet to include?