Question

Calculate the average marks by short cut method (Mean)

Marks                     No. Of students 

0-10.                                3

10-20.                             8

20-30.                           12

30-40.                           16

40-50.                           19

50-60.                           16

60-70.                            11

70-80                             5

​

Answer 1

Answer:

12

Explanation:

sum of observations/no of observations

3+8+12+16+19+16+11+5/8

=96/8=12

Answer 2

Explanation:

see very carefully .

u understood it and try to

practice this....

I hope it's helpful for u