NDA Math Statistics Part 2

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Consider the following data for the next three (03) items that follow

The marks obtained by 51 students in a class are in AP with its first term 4 and common difference 3.
[NDA-I 2022]
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Question : 15 of 44
 
Marks: +1, -0
What is the median of the marks ?
[NDA-I 2022]
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