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A person who does not know anything about french participated in a French assignment . The...

A person who does not know anything about french participated in a French assignment . The assignment  consisted of 20 multiple-choice questions (each question had five choices, and only one of them was correct). The person answered all of the questions randomly. What is the probability that two up to 7 questions were answered correctly?

a. 0.8143

b. 0.5698

c. 0.7072

d. 0.6245

Math   Statistics-And-Probability   
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