Question

Edith has a pop quiz with 5 multiple choice questions. Each question has 5 answer options. Assume that Edith randomly guesses on every question.

a) The probability of scoring 1/5 or better is 0
b) The probability of scoring exactly 2/5 is non-zero
c) The probability of scoring 0/5 is the same as 3/5
d) The probability of scoring 5/5 is the highest among all possibilities

Answer 1

To find the probability that the student guesses more than 75 percent of the questions correctly, we can use the binomial probability formula.

Step-by-step explanation:

To find the probability that the student guesses more than 75 percent of the questions correctly, we can use the binomial probability formula. Let's define a success as guessing a question correctly and a failure as guessing it incorrectly. The probability of success is 1/3, since there are three possible choices for each question. Now we need to calculate the probability of getting more than 75% correct out of 32 questions. We can use a binomial probability calculator to find this probability.