Question

The age of 50 teachers working in a secondary school in a big city are as follows :

Age (in years) 20-25 25-30 30-35 35-40 40-45 45-50 50-55

No. of teachers 2 4 5 10 15 8 5



(I) What is the class size ?

(II) What is lower limit of 45-50?

(III) What is upper limit of 50-55?

(IV) What is class mark of class 25-30?

(V) What is frequency of class interval 35 -40?

please answer with equation​

Answer 1

Answer:

1=20_25

2=45

3=55

4=55/2

5=5