Question

If a student guesses the answers to four true-false questions, what is the probability that he will guess all four correctly?

A. 7/8
B. 15/16
C. 1/16
D. 1/8

Answer 1

Can you tell probability that he will get 1 answer right by guessing ?

Answer 2

You have a 1/4 chance of getting one problem correct. And you have 4 problems. So therefore you have
\[1/4\times1/4\times1/4\times1/4\]

Answer 3

your logic is correct but data you used it wrong @austinL

Answer 4

you have 1/2 chance of getting one problem correct

Answer 5

Oh my, oops :$
Yes, it would be
\[1/2\times1/2\times1/2\times1/2\]
My sincere apologies.

Answer 6

so is the answer 1/8

Answer 7

\[\frac{ 1 }{ 2\times2\times2\times2 }\]