What does the skull mean in the stats page?

Next to the kill to death ratio what’s the skull with the x through it mean?

You mean in game? Probably means they are dead.

In the post game carnage report and you go into the service record it shows how many kills and death you have and then there is a skull next to that with a number below it. Mine is 7.2 but I can’t figure out what it is as some players are negative.

My guess would be average kills per game

It’s a number that rates your kill&assist:death ratio.

It doesn’t mean you have a 7.2 K&A/D ratio, it just means that the game deems you’re a 7.2 - so quite good.