The histogram above shows the ages of victims of a pollution. How many people were involved in the pollution?
-
A.
20 -
B.
21 -
C.
15 -
D.
18
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 & 2end{array})
(sum f ) = number of people involved in the pollution
(sum f) = 3 + 4 + 5 + 6 + 2 = 20