Question

A certain online math learning software asks only multiple choice questions with 6 options. The program...

A certain online math learning software asks only multiple choice questions with 6 options. The program requires that a student answers 8 multiple choice questions correctly before moving on to the next topic. Suppose that the student guesses at random for all of the questions.

What is the probability that a student gets the correct answer on the first 8 questions?

What is the probability that the student meets this goal in exactly 21 tries?

Math   Statistics-And-Probability   
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Answer #1

​​​​​​Here trials(questions) are independent of each other and probability of success is constant for all trials hence we can use binomial distribution.

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