Construct a frequency table with equal class intervals from the following data on the monthly wages (in rupees) of 28 labourers working in a factory, taking one of the class intervals as 210-230 (230 not included).
220, 268, 258, 242, 210, 268, 272, 242, 311, 290, 300, 319, 304, 302, 318, 306, 292, 254, 278, 210, 240, 280, 316, 306, 215, 256, 236.
Minimum observation = 210
Maximum observation = 320
The classes of equal size covering the given data are:
210-230, 230-250, 250-270, 270-290, 290-310, and 310-330
So, frequency table will be as given below,
Class | Frequency |
210 – 230 | 4 |
230 – 250 | 4 |
250 – 270 | 5 |
270 – 290 | 3 |
290 – 310 | 7 |
310 – 330 | 5 |