Question

In a recent years,it was estimate that 55% of US .adult Internet users had access to high-speed Internet connection at home or on the job.What is the probability that exactly 2 out of 5 randomly selected U.S. adults had access to high-speed Internet connections?

Answer 1

binomial distribution

Answer 2

yes

Answer 3

\[P(X=x)={n\choose x}p^x(1-p)^{n-x}\]

Answer 4

40.69%

Answer 5

i think, its been a while since stats, I don't know if I entered it in the calculator right, sounds about right though

Answer 6

0.275653125

Answer 7

just did it again, zarkon is right

Answer 8

p=55/100?

Answer 9

yes

Answer 10

i had it cumulative.

Answer 11

ty,I got it now

Answer 12

\[P(X=2)={5\choose 2}(.55)^2(1-.55)^{5-2}\]

Answer 13

good