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# S1 Probability watch

1. The probability of a biased coin come down a head is 0.4. It is tossed three times. What's the probability of getting at least two heads?

HELP i'm so confused
2. (Original post by elenf)
The probability of a biased coin come down a head is 0.4. It is tossed three times. What's the probability of getting at least two heads?

HELP i'm so confused
draw a tree diagram and look for the relevant branches
(quicker if you look for the ones you do not want)

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Updated: November 5, 2015
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