GROUPED DATA: Grouped data are number of items, things placed together to form an entity.
EXAMPLE
The following data gives the lengths , in cm of 30 pieces of iron rods:
45, 55, 65, 60, 61, 68, 59, 54, 64, 76, 50, 68, 72, 68, 80, 67, 70, 62, 79, 67, 64, 63, 71, 59, 64, 53, 57, 74, 55, 57 .
SOLUTION
CLASS INTERVALS | FREQUENCY | TALLY | CLASS BOUNDARY |
45 – 49 | 1 | 1 | 44.5 – 49.5 |
50 – 54 | 3 | III | 49.5 – 54.5 |
55 – 59 | 6 | IIII I | 54.5 – 59.5 |
60 – 64 | 7 | IIII II | 59.5 – 64.5 |
65 – 69 | 6 | IIII I | 64.5 – 69.5 |
70 – 74 | 4 | IIII | 69.5 – 74.5 |
75 – 79 | 2 | II | 74.5 – 79.5 |
80 – 84 | 1 | I | 79.5 -84.5 |
ASSESSMENT: The marks scored by 50 students in a geography examination are as follows::
60, 54, 40, 67, 53, 73, 37, 55, 62, 43, 44, 69, 39,
32, 45, 58, 48, 67, 39, 51, 46, 59, 40, 52, 61, 48,
23, 60, 59, 47, 65, 58, 74, 47, 40, 59, 68, 51, 50,
50, 71, 51, 26, 36, 38, 70, 46, 40, 51, 42 .
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