The histogram shows the heights in means of trees in a certain section of a parkhome many trees are less than 20 meters all? 491516

The number of trees which are less than 20 meters are:

                                  9

Based on the histogram we are asked to find the number of trees which are less than 20 meters in height.

  Class interval             Frequency

        4-8                             1

        8-12                            2

        12-16                           2

        16-20                          4

        20-24                          6

        24-28                          4

        28-32                          2

i.e. we are asked to find the  total number of tress that lie in the class interval 4-20.

i.e. we add the frequencies that lie in the interval 4-20

i.e. Number of trees= 1+2+2+4=9 trees.