Question

Michael takes a multiple-choice test with 5 answer choices for each question. If he randomly answers every question what is his expected score?

Answer 1

20%

Answer 2

as number of questions approaches infinity.

Answer 3

really depends on how many questions on the test right?

Answer 4

yes, in that case, use nCr ((p)^r)(1-p)^(n-r)

Answer 5

oh right, expected "score" not expected number of correct answers.

Answer 6

n= questions, r=number of correct, p=probability of correct.

Answer 7

inkyvoyd is right, expected "score" is 20%
expected number of correct answer is .2 n if n is the number of questions answered