142k views
1 vote
A coin is tossed 12 times. What is the probability of getting heads exactly 7 times?

User Azochz
by
8.5k points

2 Answers

0 votes
17% chance I think.
User Neigaard
by
7.9k points
4 votes

Answer:

Once the number of possible heads and tail in 12 tosses is
2^(12) =4096


(12!)/(\left(7!\right)\left(5!\right))\\\\(12\cdot \:11\cdot \:10\cdot \:9\cdot \:8)/(5!)\\\\(95040)/(120)\\\\792

So the probability of getting exactly 8 heads in 12 coin tosses is:
(792)/(4096)

User DrGabriel
by
7.8k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories