A multiple
-
choice quiz
contains 5 questions with 4
choices for each answer.
A
student passes the quiz if they get at
least an 80% on the quiz
.
If a student guesses
on every question
, find the probability that
she
passes
the quiz
.
I have tried c(20,8)(1/4)^8(3/4)^12
c(20,9)(1/4)^9(3/4)^11
c(20,10)(1/4)^10(3/4)^11
1 answer