(Use computer) According to a survey by consulting firm Watson Wyatt, approximately 19% of employers have eliminated perks or plan to do so in the next year (Kiplinger's Personal Finance, February 2009). Suppose 30 employers are randomly selected.

a. What is the probability that exactly 10 of the employers have eliminated or plan to eliminate perks?

b. What is the probability that at least 10 employers, but no more than 20 employers, have eliminated or plan to eliminate perks?

c. What is the probability that at most 8 employers have eliminated or plan to eliminate perks? L05