The following information is regarding marks in mathematics, obtained out of 40, scored by 50 students of 9th std. in the first unit test.
| Class interval |
Frequency (f) (No. of students) |
| 0 - 10 |
02 |
| 10 - 20 |
12 |
| 20 - 30 |
20 |
| 30 - 40 |
16 |
|
Total (N) = 50 |
From the table, fill in the blanks in the following statements.
i. For class interval 10 – 20 the lower class limit is _____ and upper class limit is _____
ii. How many students obtained marks less than 10? 2
iii. How many students obtained marks less than 20? 2 + ____ = 14
iv. How many students obtained marks less than 30? ______ + _____ = 34
v. How many students obtained marks less than 40? ______ + ______ = 50
