A trivia test has 10 multiple-choice questions, each with four possible answers. What is the probability of randomly guessing the correct answers for 9 or 10 of the questions.

Answer 1

Binomial

p=1/4 N=10 k=9,10

(10 choose 9) (0.25)^9 (0.75) + (10 choose 10) ( 0.25)^10 ( 0.75)^0 =

.0000283102294921875 + .00000095367431640625 =

0.000029+