A coin is tossed four times in a row. Draw a tree diagram to display the outcomes. What is the probability that at least two tails will appear?

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A coin is tossed four times in a row. Draw a tree diagram to display the outcomes. What is the probability that at least two tails will appear?

Solution

1116

Decimal

0.6875

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Solution steps

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The possible outcomes when a coin is thrown four times are 2· 2· 2· 2
Therefore, the number of possible outcomes: 2⁴

Find the number of favorable outcomes of at least 2 tails will appear: 11

Probability = number of favorable outcomestotal number of outcomes

=112⁴

2⁴=16

=1116

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+▭▭	>	4	5	6	×	☐☐☐
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A coin is tossed four times in a row. Draw a tree diagram to display the outcomes. What is the probability that at least two tails will appear?

Solution

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