Question

. An instructor gives her class a set of 10 problems with the information that the final exam will consist of a random selection of 5 of them. If a student has figured out how to do 7 of the problems, what is the probability that he or she will answer correctly?

Answer 1

0.083

Explanation:

Total number of questions 10

with the information that the final exam will consist of a random selection of 5 of them

number of questions the student had figured out= 7

P( All 5 correct)= (5 chosen among 7)/( 5 chosen among 10)

P( all 5 correct)= 7C5÷10C5

= 21÷252= 0.083