Probability at its best !

by **SAM** Thu May 22, 2008 2:25 am

For one toss of a certain coin, the probability that the outcome is Heads is 0.6. If the coin is tossed 5 times , which of the following is the probability that the outcome will be heads atleast 4 times ?

The answer is 5(0.6)^4(0.4) + (0.6)^5. Though I was close and guessed (0.6)^4(0.4) + (0.6)^5, I am not sure why we multiply the first part with 5. Kindly suggest. Thx.

by **RonPurewal** Wed May 28, 2008 3:33 pm

please don't double post, especially in the wrong folder. thank you.
http://www.manhattangmat.com/forums/pos ... html#11541

and also remember to follow the forum rules: post title = first 8 words or so of the problem statement.
thank you.