Mathematics
Construct a frequency table for the following ages (in years) of 30 students using equal class-intervals, one of them being 9-12, where 12 is not included.
18, 12, 7, 6, 11, 15, 21, 9, 8, 13, 15, 17, 22, 19, 14, 21, 23, 8, 12, 17, 15, 6, 18, 23, 22, 16, 9, 21, 11, 16
Answer
Given class is 9 - 12 (12 is not included)
so class size = 12 - 9 = 3
Minimum age = 6
Maximum age = 23
So the class intervals will be
6 - 9, 9 - 12, 12 - 15, 15 - 18, 18 - 21, 21 - 24
Frequency distribution table :
| Ages (Class Interval) | Tally-Marks | Frequency |
|---|---|---|
| 6 – 9 | 5 | |
| 9 – 12 | IIII | 4 |
| 12 – 15 | IIII | 4 |
| 15 – 18 | 7 | |
| 18 – 21 | III | 3 |
| 21 – 24 | 7 | |
| Total | 30 |
Related Questions
Following data gives the number of children in 40 families :
1, 2, 6, 5, 1, 3, 2, 6, 2, 3, 4, 2, 0, 4, 4, 3, 2, 2, 0, 0, 1, 2, 2, 4, 4, 3, 2, 1, 0, 5, 1, 2, 4, 3, 4, 1, 1, 6, 2, 2
Represent it in the form of a frequency distribution.
The marks obtained by 40 students of a class in an examination are given below. Present the data in the form of a frequency distribution using equal class-size, one such class being 10 - 15(15 not included).
3, 20, 13, 1, 21, 13, 3, 23, 16, 13, 18, 12, 5, 12, 5, 24, 9, 2, 7, 18, 20, 3, 10, 12, 7, 18, 2, 5, 7, 10, 16, 8, 16, 17, 8, 23, 21, 6, 23, 15
The weekly wages (in rupees) of 30 workers in a factory given below :
630, 635, 690, 610, 635, 636, 639, 645, 698, 690, 620, 660, 632, 633, 655, 645, 604, 608, 612, 640, 685, 635, 636, 678, 640, 668, 690, 606, 640, 690
Represent the data in the form of a frequency distribution with class size 10.
The weights in grams of 50 apples picked at random from a consignment are as follows :
131, 113, 82, 75, 204, 81, 84, 118, 104, 110, 80, 107, 111, 141, 136, 123, 90, 78, 90, 115, 110, 98, 106, 99, 107, 84, 76, 186, 82, 100, 109, 128, 115, 107, 115, 119, 93, 187, 139, 129, 130, 68, 195, 123, 125, 111, 92, 86, 70, 126
Form the grouped frequency table by dividing the variable range into intervals of equal width of 20 g.