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4 votes
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

1 Answer

5 votes

Answer:

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

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