10. In a 2 hour Mathematics paper, there are 20 questions to be answered by Yao. After
1 hour he had answered 5 questions.
b) What fraction of the time had gone?

Step-by-step explanation:

1

 The  correct option is  A

2

 The  correct option is  C

3

 The  correct option is  C

Step-by-step explanation:

From the question we are told that

   The proportion of the winning bid from a regular bidder is  

   The proportion of the winning bid from a occasional bidders is  

     The proportion of the winning bid from a first- time bidders is  

    The proportion of  satisfactory jobs done by a regular bidders is

The proportion of  satisfactory jobs done by a occasional bidders is    

The proportion of  satisfactory jobs done by a first- time bidders is  

Generally the probability that a job will be done by a first-time bidder and be satisfactory is mathematically represented as

=>        

=>      

Generally the probability that a job will be satisfactory is mathematically represented as

=>    

Generally given that a job is satisfactory, what is the probability that it was done by a regular bidder is mathematically evaluated as