Consider:
| Marks obtained | ≥0 | ≥10 | ≥20 | ≥30 | ≥40 | ≥50 |
|---|---|---|---|---|---|---|
| No. of students | 63 | 58 | 55 | 51 | 48 | 42 |
The frequency of the class 30–40 is
3
4
48
51
Step 1: The given table is a cumulative frequency table. It tells us how many students scored marks greater than or equal to a certain value.
Step 2: To find the number of students in the interval 30–40, we subtract:
Step 3: Subtract the two values:
\( 51 - 48 = 3 \)
Step 4: Therefore, the frequency of the class 30–40 is 3.
Final Answer: Option (A)