The marks (out of 100) obtained by 70 students in a Mathematics test are grouped as…
MATHEMATICS · Multi-part · CBSE · Mathematics · Statistics · Statistics
Problem
The marks (out of 100) obtained by 70 students in a Mathematics test are grouped as follows: (a) Copy the table below and add two additional columns that you consider necessary for the systematic calculation of the arithmetic mean of the marks.| Marks (class interval) | 10–20 | 20–30 | 30–40 | 40–50 | 50–60 | 60–70 | 70–80 |
|---|---|---|---|---|---|---|---|
| Number of students | 2 | 5 | 11 | 22 | 15 | 10 | 5 |