Question

When taking a 7 question multiple choice test, where each question has 3 possible answers, it would be unusual to get or more questions correct by guessing alone. Give your answer in the box above as a whole number.

Answer 1

The probability to get one question correct is , if the person is guessing.

Since there are 3 options and 1 is correct

There is a total of 7 multiple-choice questions.

Now the probability to get 'a' or more questions correct by guessing alone can be calculated using the binomial probability distribution.

Now the probability to get '6' or more questions correct by guessing alone can be calculated as

HENCE it would be unusual to get 6 or more questions correct by guessing alone