According to the Canadian Journal of Information and Library Science (Vol. 33, 2009), nearly 90% of workers

Question:

According to the Canadian Journal of Information and Library Science (Vol. 33, 2009), nearly 90% of workers in law libraries are satisfied with their job. Assume the true proportion of law librarians in Canada who are satisfied with their job is .9. In a random sample of 20 law librarians in Canada, what is the probability that at most 2 are unsatisfied with their job?