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The marks obtained by the students of a class in Math class test (out of 30) were as follows:
12, 23, 29, 15, 30, 20, 22, 24, 28, 30, 12, 11, 15, 16, 18, 10.5, 28, 25, 11, 15.

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answer is D.

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Detailed Solution

Let us make a frequency table to arrange the given data:

Marks obtained	Frequency
10.5	1
11	2
12	1
15	3
16	1
18	1
20	1
22	1
23	1
24	1
25	1
28	2
29	1
30	1

The most common marks that has been obtained by students is 15, which has been obtained by 3 students.

Hence, mode = 15

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