\(\frac{27}{40}\)
\(\frac{17}{20}\)
\(\frac{33}{40}\)
\(\frac{3}{20}\)
Correct answer is B
Total number of pupils = 7 + 27 + 6 = 40
n(at least 11 years old) = 27 + 7 = 34.
P(picking a pupil who is at least 11 years old) = \(\frac{34}{40} = \frac{17}{20}\).
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