Question

Mrs. Gomes found that 40% of students at her high school take chemistry. She randomly surveys 12 students. What is the probability that exactly 4 students have taken chemistry? Round the answer to the nearest thousandth. A)0.005 B)0.008 C)0.213 D)0.227

Answer 1

binomial distribution

Answer 2

\[\Pr(X=k)=\left(\begin{matrix}12 \\ k\end{matrix}\right)(0.40)^k (1-0.40)^{12-k}\]

Answer 3

we let K =4
this will help u get answer

Answer 4

r u getting it?

Answer 5

that is the formula it gave i came up with 0,008

Answer 6

is 0.008 correct?

Answer 7

yes

Answer 8

thank you

Answer 9

did u get it right?

Answer 10

hey i think ur wrong i put the eq in wolfram alpha and its giving me 0.005

Answer 11

ok thanks i will change it