Use the adjoining table to find:
(i) upper and lower limits of fifth class.
(ii) true class limits of the fifth class.
(iii) class boundaries of the third class.
(iv) class mark of the fourth class.
| Class | Frequency |
| 28-32 | 5 |
| 33-37 | 8 |
| 38-42 | 13 |
| 43-47 | 9 |
| 48-52 | 7 |
| 53-57 | 5 |
| 58-62 | 2 |
Solution:
(i) Upper and lower limits of fifth class are as follows.
Upper limit = 52 and lower limit = 48
(ii) True class limits of the fifth class
Upper limit = 52.5 and lower limit = 47.5
(iii) Class boundaries of the third class is 37.5 and 42.5.
(iv) Class mark of the fourth class = (43 + 47)/2 = 90/2 = 45
(v) Width of sixth class=57.5 – 52.5 = 5
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