Question

On a test there are 10 true/false questions. If you guess on each of them, what is the probability that you will get exactly 6 correct?

Answer 1

It should be \[ \frac {\binom{10} 6}{2^{10}} \]

Answer 2

It says that I should be using the formula:
(nCx)(Px)(1-p)^(n-x)
I don't remember what is what.

Answer 3

Binomial distribution.

Answer 4

In this case, n = 10, x = 6 and p = 1/2 = 0.5

Answer 5

How did you get p=1/2?

Answer 6

P(true) = 1/2
P(false) = 1/2

Answer 7

p is the probability of getting an answer choice correct

Answer 8

Thanks guys