Which is a normal temperature for a laptop?

I have a Samsung series 5 my temperature is around 77-80°c when i am playing, and 48-54 on normal use it laptop don't have a month and I am not sure if it is normal.

Intel® Core™ i5-3210M CPU @ 2.50GHz × 4    
8 GB of RAM    
Nvidia optimus 650M (I am using Bumblebee)    
Ubuntu 12.04   

On the Intel site, Link to your CPU, after Tjunction you have 105ºC. This means that it stands up to that temperature.

Normal may be a matter of opinion, but for me, normal is between 50ºC to 70ºC for low usage and up to 80ºC if all the processors are working close to 100%. If somehow the 90ºC are passed I would say that something is wrong.

Those temperatures look fine to me for that kind of configuration. I've seen far worse.