दिए गए आंकड़ों का माध्य ज्ञात कीजिए:

वर्ग-अन्तराल 10-20 20-30 30-40 40-50 50-60 60-70 70-80
 बारंबारता 9 13 6 4 6 2 3

  1. 39.95
  2. 35.70
  3. 43.95
  4. 23.95

Answer (Detailed Solution Below)

Option 2 : 35.70
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Detailed Solution

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प्रयुक्त सूत्र:

वर्गीकृत आंकड़ों का माध्य निम्न द्वारा दिया गया है,

\(\bar X\ = \frac{∑ f_iX_i}{∑ f_i}\)

जहां, \(u_i \ = \ \frac{X_i\ -\ a}{h}\)

Xi = वर्ग i का माध्य

f= वर्ग i के अनुरूप बारंबारता

दिया गया है:

वर्ग-अन्तराल 10-20 20-30 30-40 40-50 50-60 60-70 70-80
बारंबारता 9 13 6 4 6 2 3

 

गणना:

अब, नीचे, आंकड़ों के माध्य की गणना करने के लिए ∑fiXi और ∑fi को ज्ञात करना,

वर्ग-अन्तराल fi Xi fiXi
10 - 20 9 15 135
20 - 30 13 25 325
30 - 40 6 35 210
40 - 50 4 45 180
50 - 60 6 55 330
60 - 70 2 65 130
70 - 80 3 75 225
  ∑fi = 43 ∑X= 315 ∑fiXi = 1535


तब,

हम जानते हैं कि वर्गीकृत आँकड़ों का माध्य है

\(\bar X\ = \frac{∑ f_iX_i}{∑ f_i}\)

\(\frac{1535}{43}\)

= 35.7

अतः, वर्गीकृत आँकड़ों का माध्य 35.7 है। 

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