# Math Help - probability distributions

1. ## probability distributions

A coin is tossed 8 times. Calculate the probability of tossing
a) 6 heads and 2 tails
b) 7 heads and 1 tail

2. Originally Posted by shell
A coin is tossed 8 times. Calculate the probability of tossing
a) 6 heads and 2 tails
b) 7 heads and 1 tail
c. $\sum\limits_{k = 6}^8 {\binom{8}{k}\left( {0.5} \right)^8 }$

3. Thank you for your help. But I am really struggling with this concept... do I use that equation for a) and b) also?

4. Originally Posted by shell
Thank you for your help. But I am really struggling with this concept... do I use that equation for a) and b) also?
What do you understand about binomial distributions?
That is after all what this question is all about.
Your textbook should contain a complete explication of that topic.
If you need more, see this.