If a fair coin is tossed twice, what is the probability of obtaining at least one head?
- 0.25
-
0.75
- 0.5
- 0.33
The correct answer is: B
Explanation
OR
When a coin is tossed twice, the sample space is given by S ={HH HT TH TT} and the event of obtaining at least a head is provided by A ={HH HT TH}.
Therefore the probability of getting at least a head is given by:
P = n(A) ÷ n(S)
P = 3 ÷ 4
P = 0.75
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