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NDA Math Statistics Part 2

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Consider the following frequency distribution for the next three (03) items that follow Q.No 118 - 120 :
Class0−20 20−40 40−60 60−80 80−100
Frequency17p+q 32 p−3q19
The total frequency is 120 . The mean is 50 .
[NDA-I 2022]
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