Mathematics

Problem

A histogram shows the ages (in years) of 40 trees in a botanical garden. The class intervals

0

–

5

5

–

10

10

–

15

, and

15

–

20

all have equal width of

5

years. The heights of the bars are

4\,\text{cm}

10\,\text{cm}

14\,\text{cm}

, and

12\,\text{cm}

respectively. Which age group is the modal class? a) 10–15 years b) 15–20 years c) 5–10 years d) 10–20 years