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 [tex]\frac{1}{5}[/tex]
i.e. 1 out of 5 questions is correct
Using binomial distribution
where n=40 p=[tex]\frac{1}{5}[/tex]
mean of binomial distribution is np
therefore mean of no of correct answers=[tex]40\times \frac{1}{5}[/tex]
                                  =8
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