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दिये गये आँकड़े का माध्य ज्ञात करें :

वर्ग अंतराल 0-10 10-20 20-30 30-40 40-50
बारम्बारता 5 10 25 5 11

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वर्ग-अंतराल बारंबारता (f) वर्ग चिह्न (x) \(f\times x\)
0-10 5 5 25
10-20 10 15 150
20-30 25 25 625
30-40 5 35 175
40-50 11 45 495
Σf = 56 Σfx = 1470

माध्य \(\bar {x} = \frac {\sum fx}{\sum f}\)

\(= \frac {1470}{56} \)

\(= 26.25\)

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