## anonymous 3 years ago when flipping 4 coins, what is the probability of "more heads than tails"?

1. anonymous

satellite73 help me after this one

2. anonymous

that means either 3 heads and one tail or 4 heads the probability of all the possibilities can be seen by looking at the fourth row of pascal's triangle $1,4,6,4,1$ the denominator of each of the probabilities is $$2^4=16$$ so the probabilities are $\frac{1}{16}, \frac{4}{16},\frac{6}{16},\frac{4}{16}, \frac{1}{16}$ for no heads, one head, two heads, three heads, four heads respectively

3. anonymous

more heads than tails means add up the last two, i.e. $\frac{4}{16}+\frac{1}{16}$

4. anonymous

ok i get it now, thx!

5. anonymous

yw