There are m boys and 12 girls in a class. What is the probability of
MATHEMATICSWAEC 2004
There are m boys and 12 girls in a class. What is the probability of selecting at random a girl from the class?
- A. \(\frac{m}{12}\)
- B. \(\frac{12}{m}\)
- C. \(\frac{12}{m+12}\)
- D. \(\frac{12}{m-12}\)
Correct Answer: C. \(\frac{12}{m+12}\)
Explanation
Prob. (a girl) \(=\frac{Number\hspace{1mm} of\hspace{1mm} girls}{Number \hspace{1mm} of \hspace{1mm} boys \hspace{1mm} and \hspace{1mm} girls\hspace{1mm} in \hspace{1mm} class}\\
= \frac{12}{m+12}\)
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