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You are taking a 100 question multiple-choice exam with 5 choices for answers on each question....

You are taking a 100 question multiple-choice exam with 5 choices for answers on each question. Each question is worth 1 point and you are docked 1/5 point for each wrong answer. Suppose you guess on all 100 questions, what is the expected value for your grade?

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Answer #1

Answer:

Given,

p = 1/5

= 0.2

sample n = 100

Expected value = np

= 100*0.2

= 50

Expected value = 50

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