Given below are the marks secured by 35 students in a test:
41, 32, 35, 21, 11, 47, 42, 00, 05, 18, 25, 24, 29, 38, 30, 04, 14, 24, 34, 44, 48, 33, 36, 38, 41, 46, 08, 34, 39, 11, 13, 27, 26, 43, 03.
Taking class intervals 0-10, 10– 20, 20 – 30.
frequency distribution table. Find the number of students obtaining below 20 marks
Solution:
The cumulative frequency distribution table:
Class | Tally Marks | Frequency | Cumulative Frequency |
0-10 | 5 | 5 | |
10-20 | 5 | 10 | |
20-30 | 7 | 17 | |
30-40 | 10 | 27 | |
40-50 | 8 | 35 |
The number of students obtaining below 20 marks is 10.
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