Question

an engineer is chosen at random between 1 and 100. find the probability that it is
. 1) divisible by 8 2) not divisible by 8

Answer 1

total numbers between 1 and 100=98
a... let E=divisible by 8=8,16,24,32,40,48,56,72,81,88,96
      p(e)=12/98=0.1224
b.... let P(E')=1-P(E)
                    =1-0.1224
                    =0.8756

Answer 2

Divisible by 8
12/100=3/25
Not divisible by 8
88/100=22/25