Of 120 students writing an exam, 100 are expected to pass. The estimated probability that a randomly selected student will fail the exam is

1/5 probability of selecting a student that will fail

Step-by-step explanation:

Given,

120-total students

100-pass

Find the amount that will fail,

total students - pass

-substitute in given values

120-100=20

20 students will fail

Proportion to find the probability,

(part/whole)

-substitute for situation

(fail/total students)

-substitute values

20/100

-simplify (:20)

1/5