A purchasing unit for a state government has found that 60% of the winning bids for office-cleaning contracts come from regular bidders, 30% from occasional bidders, and 10% from first-time bidders. The services provided by successful bidders are rated satisfactory or unsatisfactory after one year on the job. Experience indicates that 90% of the jobs are satisfactory given that they are done by regular bidders, as are 80% of the jobs done by occasional bidders and 60% of the jobs done by first-time bidders.

What is the probability that a job will not be satisfactory?

a.0.84

b.0.16

c.0.90

D.0.80

Given that a job is satisfactory, what is the probability that it was done by a first - time bidder?

1. 0.60
2. 0.93
3. 0.06
4. 0.07

Given that a job is unsatisfactory, what is the probability that it was done by an occasional bidder?

a.0.60

b.0.06

c.0.37

D.0.20

What is the probability that a job will be both satisfactory and unsatisfactory?

a.0

b.1.00

c.0.84

d.0.16