Correct Answer: Option A

Explanation

\(\begin{array}{c|c} \text{Age in years} & 10 & 20 & 30 & 40 & 50 \\\hline \text{frequency} & 3 & 4 & 5 & 6 & 2\end{array}\)

\(\sum f \) = number of people involved in the pollution

\(\sum f\) = 3 + 4 + 5 + 6 + 2 = 20

There is an explanation video available below.

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