Question

The class mark of class interval 20-30 is ______________​

Answer 1

Answer:

10

i think you can understand with my answer

Step-by-step explanation:

Answer 2

Answer:

25

Step-by-step explanation:

upper limit=30

lower limit=20

class marks = upper limit+ lower limit/2

=30+20/2

=50/2

=25

hope it helps.: )