The table above shows the number of pupils in each age group in a class. What is the probability that a pupil chosen at random is at least 11 years old?
P(At least 11 yrs) = P(11yrs) + P(12yrs)
= \(\frac{27}{40}\) + \(\frac{7}{40}\)
= \(\frac{34}{40}\)
= \(\frac{17}{20}\)
There is an explanation video available below.
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