Word Count : 392

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असतत (वितरित) श्रेणी के लिए समांतर माध्य (Harmonic Mean, H) निकालने की परिभाषा है: $H=\dfrac{N}{\sum \dfrac{f_i}{x_i}}$, जहाँ $N=\sum f_i$। नीचे दिए गए आँकड़ों में अंकों (x) के साथ विद्यार्थियों की संख्या (f) दी है: 10(8), 20(21), 30(23), 40(17), 50(15), 60(9), 70(5), 80(2); कुल $N=100$ पहली विधि: प्रत्यक्ष विधि (Direct Method) इस विधि में प्रत्येक वर्ग के लिए $1/x$ तथा $f/x$ निकाले जाते हैं और $\sum (f/x)$ का योग लेकर ऊपर के सूत्र से H निकाला जाता है। गणना-सार: ___ __________ _________ _______ _______ ______ _____ ______ ___.
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