使用系统。R中的时间，变化非常大

I have written two functions in R and I need to see which is faster so I used system.time. However, the answers are so varied I can't tell. As its for assessed work I don't feel I can actually post the code (in case someone corrects it). Both functions call rbinom to generate multiple values and this is the only part that isn't a simple calculation.I have written two functions in R and I need to