Question

Find the mean from the following.
Marks No of students
10-20 4
20-30 8
30-40 4
40-50 6
50-60 2

Answer 1

(15.4 +25.8+35.4+45.6+55.2) /4+8+4+6+2

60+200+140+270+110/24

780/24

=32.5