begin array c c text Age in years amp 10 amp 11... - JAMB Mathematics 2007 Question
(\begin{array}{c|c} \text{Age in years} & 10 & 11 & 12\
\hline \text{No. of pupils} & 6 & 27 & 7\end{array})
the table above shows the number of pupil in each age group in a class. What is the probability that a pupil chosen at random is at least 11 years old?
A
\(\frac{27}{40}\)
B
\(\frac{3}{30}\)
C
\(\frac{17}{20}\)
D
\(\frac{33}{40}\)
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Correct Option: C
Total number of pupils = 6 + 27 + 7 = 40
Number of pupils that are at least 11 years old = 27 + 7
= 34
therefore prob. (at least 11 years) = (\frac{34}{17})
= (\frac{17}{20})
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