What is the difference between the average number of hardbound books sold by shops A, B and D and the average number of paper back books sold by shops C and D?दुकानों A, B और D द्वारा बेची गई हार्डबाउंड पुस्तकों की औसत संख्या तथा दुकानों C और D द्वारा बेची गई पेपरबैक पुस्तकों की औसत संख्या के बीच कितना अंतर है?

1. A267
2. B400
3. C1570
4. D1750

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Correct answer: D. 1750

Explanation

Average hardbound of A, B, D = (3500 + 3900 + 5500) ÷ 3 = 12900 ÷ 3 = 4300. Average paperback of C, D = (5500 + 6600) ÷ 2 = 12100 ÷ 2 = 6050. Difference = 6050 − 4300 = 1750.A, B, D की हार्डबाउंड औसत = (3500 + 3900 + 5500) ÷ 3 = 12900 ÷ 3 = 4300। C, D की पेपरबैक औसत = (5500 + 6600) ÷ 2 = 12100 ÷ 2 = 6050। अंतर = 6050 − 4300 = 1750।