Question

pre-test complete
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janie flips a coin 70 times and records if it comes up heads. if getting heads is a success, what is the probability of a failure?
0.2
0.5
0.7
1.00

Explanation:

Step1: Define success/failure probability

For a fair coin, $P(\text{success, heads}) = 0.5$.

Step2: Calculate failure probability

Total probability = 1, so $P(\text{failure}) = 1 - P(\text{success})$.
$P(\text{failure}) = 1 - 0.5 = 0.5$

Answer:

0.5