Problem-Solving and Data Analysis practice question

Answer: A. 3/4

The four equally likely outcomes are HH, HT, TH, TT. Only TT has no head, so 3 of 4 outcomes have at least one head: 3/4.

Why the other answers are wrong

B. 1/2

1/2 is the probability of a head on ONE flip, or of exactly one head in two flips (HT or TH). 'At least one' also includes HH.

C. 1/4

1/4 is the probability of NO heads (TT), or of two heads (HH).

D. 2/3

There are 4 equally likely outcomes, not 3.

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