No sign of the avalanche so i will fire in my answer.

If G has a 9% chance of finishing ahead of each of A,B,C,D & E and assuming independance then the probability of G NOT making the 8 is 0.91^5= 0.624 or 62.4%. Therefore the probability of G finishing ahead of at least one of A,B,C,D & E and hence making the top 8 will be 1-0.624 = 0.376 = 37.6%.