So I got a mp40 with 40 rounds and I got about 56 kids in my class how many rounds do I need to kill every

To shoot that many kids with on 40 bullets you put two kids behind each other and put the gun in the front kids mouth and it should get them both with one bullet

i think that you should ask google for the answer to that problem because if we don't know it google does

answer:   35 % is the probability of a late departure or an early arrival.

step-by-step explanation:

let l represents the late departure and e represents the early departure.

then, according to the question,

p(l) = 12 %,   p(e) = 27 % and = 4 %

and, we have to find out,

but, we know that,

which is the required equation that will use to find the probability of a late departure or an early departure.

therefore,   the probability of a late departure or an early arrival =   35 %