Flashcard 11 - Upper Level: Quantitative Reasoning Flashcard Set for the ISEE

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The correct answer is:

25


Explanation:

The formula for the probability of an event happening is:

P = number of ways it can happen ÷ number of possible outcomes

\[1 \div 2 = \frac{1}{2}\]

So, there’s \(\frac{1}{2}\) chance that the 50 tosses will result in heads, or

\[50 \cdot \frac{1}{2} = \frac{50}{2} = 25\]

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