Question

A coin is tossed three times. Determine the probability of two or more heads.

1. 3 over 4

2. 1 half

3. 1 fourth

4. 3 over 8

Answer 1

3. 1/2

Explanation:

`P(X=x)=p^(x) (1-p)^(n-x)`

X= number of heads

p= probability of heads (one half because it is a coin- either heads or tails)

n= number of times coin is tossed

`P(X\geq 2)=0.5^(2)(1-0.5)^(3-2)+0.5^(3) (1-0.5)^(3-3)`

`P(X\geq 2)=0.5`