This is a purely random post that I decided to do after seeing Star Trek into Darkness.
Having always been fascinated by the fact that Red Shirts, in the Star Trek: The Original Series, were always getting killed off, I decided to do some research. Here is what I found out.
In the three seasons of TOS, only 25 Red Shirts died.
Of these only 1 was female.
20 of these were Security Officers (80%)
2 were engineers (8%)
1 was a Transporter Chief (4%)
1 was a Yeoman (4%)
1 was an unknown rank (4%)
17 had names (68%)
8 were unknown characters (32%)
Season 1 was the safest season to be a Red Shirt as only 4 died. (16%)
Season 2 was a blood bath as 16 Red Shirts were massacred. (64%)
Season 3 was also a safer time to be a Red Shirt as only 5 died. (20%)
10 Red Shirts died aboard The Enterprise (40%)
15 Red Shirts died on Away Missions (60%)
A Red Shirt without a name, who avoided Away Missions and was not a Security Officer or worked in Engineering, had a better than average chance of surviving aboard The Enterprise. This chance dramatically increased if the Red Shirt was female.