Answer:8
Step-by-step explanation:
We have given test consists of 40 multiple choice questions having five options for each question.
Suppose there is one correct answer to each question
therefore probabilty of getting a correct answer on making a guess is
i.e. 1 out of 5 questions is correct
Using binomial distribution
where n=40 p=
mean of binomial distribution is np
therefore mean of no of correct answers=
=8