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There are m boys and 12 girls in a class. What is the probability of selecting a...


Question

There are m boys and 12 girls in a class. What is the probability of selecting at random a girl from the class?

Options

A) \(\frac{m}{12}\)

B) \(\frac{12}{m}\)

C) \(\frac{12}{m+12}\)

D) \(\frac{12}{m-12}\)

The correct answer is C.

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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Dicussion (1)

  • 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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