Dúvida prob. de Estatística

[RJ1572]

Boa noite pessoal.

Bom, estou um pouco enrolado com a resolução deste problema:

The on-line access computer service industry is growing at an extraordinary rate. Current estimates suggest that only 31% of the home-based computers have access to on-line services. This number is expected to grow quickly over the next five years. Suppose 25 people with home-based computers were randomly and independently sampled. Find the probability that fewer than three of those sampled currently have access to on-line services.

No gabarito a resposta seria 0.006812.

Grato desde já.

[RJ1572]

Ok, dúvida resolvida.

Obrigado.