The table gives some information about the heights of 30 plants. Height, h in cm
Frequency
0<h < 10
1
10 <h < 20
9
20 <h < 30
7
30 <h < 40
13
Which class interval contains the median?
Select your answer.
osh <10 10 sh< 20 20 sh < 30 30 sh<40
А
B
C
D