A fair coin is tossed 7 times. What is the probability of exactly 6 heads?
Answer and explanation
Correct answer: A.
- Step 1: There are equally likely sequences.
- Step 2: of them have 6 heads: probability .
Answer
.
Why not the others: : The number of ways to choose positions was left out. : The proportion of heads was used. : The denominator was instead of .
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