एक संख्या 18 से उतनी ही अधिक है जितनी 81 से कम संख्या ज्ञात कीजिए
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5
Answer:
1/2(n/2th observation + n/2+1 th observation)
= 1/2(18 + 81)
= 1/2× 99
= 31.5
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