Question

According to an article, 35% of all cars crossing a toll bridge have a commuter sticker. What is the probability that among 13 randomly selected cars waiting to cross the bridge at least 2 have commuter stickers?

Answer 1

at least two means not zero and not one

Answer 2

ok this one is hard i dont understand

Answer 3

the probably that none have the sticker is \(.65)^{13}\) and the probability that one has the sticker is \(13\times (.65)^{12}\times (.35)\)

Answer 4

compute these numbers, add them up, then subtract the result from one

Answer 5

how do u do that? can u varify my answer with urs?

Answer 6

"at least 2" means 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 or 11 or 12 or 13

this is too hard to compute
so you compute 0 or 1, then subtract that from 1

Answer 7

okay what did u get as a final answer?

Answer 8

http://www.wolframalpha.com/input/?i=1-%28.65%29^%2813%29-13%28.65%29^%2812%29*.35

Answer 9

thank u i got the same answer