Question

Find the indicated probability. Round to the nearest thousandth. A study conducted at a certain college shows that 55% of the school's graduates find a job in their chosen field within a year after graduation. Find the probability that among 7 randomly selected graduates, at least one finds a job in his or her chosen field within a year of graduating.

Answer 1

this is binomial probability

and can be handed by using the complementary event

of P(at least 1 ) = 1 - P(non have a job)

so the formula is

\[^7C_{0} (0.55)^0(0.45)^7\]

then subtract that value from 1

and you'll have an answer...

hope it helps

Answer 2

Need combination formula? I did not think so.

Just P(at least one) = 1 - none of 7 = 1 - (0.45)^7 I think.

Answer 3

that is correct..