# The Naked Scientists Forum

### Author Topic: What are the odds of 500 heads and 500 tails if a coin is flipped 1000 times?  (Read 2542 times)

#### latebind

• Sr. Member
• Posts: 248
• Hello World
##### What are the odds of 500 heads and 500 tails if a coin is flipped 1000 times?
« on: 02/01/2010 17:08:13 »
If you flipped a standard coin 1000(thousand) times, then what are the chances that you would get exactly 500 heads and 500 tails??

[MOD EDIT - PLEASE ENSURE THAT YOU PHRASE YOUR THREAD TITLES AS QUESTIONS. THIS IS OUR FORUM POLICY. THANKS. CHRIS]
« Last Edit: 03/01/2010 12:26:06 by chris »

#### RD

• Neilep Level Member
• Posts: 8134
• Thanked: 53 times
##### Re: What are the odds of 500 heads and 500 tails if a coin is flipped 1000 times?
« Reply #1 on: 02/01/2010 17:58:03 »
Quote
The chance ... to get 500 "heads" and 500 "tails" in 1000 tosses: 2.52%.
http://saliu.com/formula.html#Binomial

#### The Naked Scientists Forum

##### Re: What are the odds of 500 heads and 500 tails if a coin is flipped 1000 times?
« Reply #1 on: 02/01/2010 17:58:03 »