Multiple choice

If the probability of getting heads on tossing a biased coin is 0.3, what is the probability of getting tails?

  1. 0.8

  2. 0.7

  3. 0.5

  4. 0.4
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B Correct answer
Explanation

The sum of probabilities of all mutually exclusive and exhaustive events is 1. P(Heads) + P(Tails) = 1. 0.3 + P(Tails) = 1, so P(Tails) = 0.7.

AI explanation

The sum of probabilities for all possible outcomes of a coin toss must equal 1. Since getting heads and getting tails are mutually exclusive and exhaustive events, add their probabilities to equal 1. Subtract the probability of heads, 0.3, from 1 to find the probability of tails, which is 0.7.

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