Given below are the marks secured by 35 students in a test:

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 IIII 5 5
10-20 IIII 5 10
20-30 IIII II 7 17
30-40 IIII IIII 10 27
40-50 IIII III 8 35

The number of students obtaining below 20 marks is 10.

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