The following table shows the life (in months) of a sample of eighty 7-watt LED bulbs produced by a manufacturer:
| Life Time of LED | ||||
| 68 | 97 | 20 | 33 | 21 |
| 31 | 35 | 48 | 52 | 52 |
| 59 | 60 | 08 | 70 | 36 |
| 34 | 83 | 05 | 09 | 11 |
| 22 | 24 | 26 | 26 | 38 |
| 39 | 43 | 46 | 54 | 41 |
| 72 | 77 | 74 | 05 | 14 |
| 16 | 41 | 52 | 80 | 13 |
| 19 | 36 | 88 | 27 | 03 |
| 07 | 12 | 18 | 62 | 43 |
| 52 | 59 | 62 | 16 | 52 |
| 94 | 04 | 05 | 07 | 15 |
| 16 | 12 | 20 | 22 | 34 |
| 38 | 22 | 70 | 77 | 12 |
| 10 | 20 | 13 | 13 | 16 |
| 15 | 15 | 74 | 18 | 30 |
i) Form a frequency distribution by taking suitable width,
ii) Construct histogram and stem-and-leaf diagram,
iii) Form cumulative frequency curves (ogives) on one graph.
iv) Find the average (median) of the life of LED bulbs with the help of ogives.
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