A multiple choice quiz has five questions. Each question has four answer choices. If you guess every answer, what is the probability of getting at least three correct?

Question

anonymous · Answer

well, to start you would want to find the fractions of each probability

anonymous · Answer

Each question has four answers, so 1/4, times the amount of questions 1/5 gives you 1/20

anonymous · Answer

so the probability would be 1/20 or 5% ?

anonymous · Answer

not quite, we have to figure out the probability for getting at least 3 questions out of 5 right

anonymous · Answer

yes

anonymous · Answer

so you need at least three right, so (1/5)3

anonymous · Answer

^3

anonymous · Answer

ohhhh

anonymous · Answer

i got .008

anonymous · Answer

wait i may be wrong

anonymous · Answer

you would do 1/4 * 1/4 * 1/4 * 1/4 * 1/4

anonymous · Answer

9.765 E^-4 that what i got

anonymous · Answer

is there another step or something?

anonymous · Answer

nope, im pretty sure thats the answer, but check it just to make sure.

anonymous · Answer

i the 9.765 E^-4 a probability ?

anonymous · Answer

*is