Question

30. Find the mean from the following data :-

Marks
0 - 10
10 - 20
20 - 30
30 - 40
40 - 50

Number of students
20
24
40
36
20​

Answer 1

Explanation:

$(5 \times 10) + (15 \times 24) + (25 \times 40) \times (35 \times 36) + (45 \times 20)$