The following information is regarding marks in mathematics, obtained out of 40, scored by 50 students of 9th std. ¡n the first unit test.
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 20? 2 + ____ = 14
iii.How many students obtained marks less than 30?_____ + _____ = 34
iv. How many students obtained marks less than 40? ______ + ______ =50
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