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If X1 = 4, X2 = 5, N1 = 10, N2 = 15, then collective mean would be  (a) 4.5  (b) 4.6 

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If X1 = 4, X2 = 5, N1 = 10, N2 = 15, then collective mean would be 

(a) 4.5 

(b) 4.6 

(c) 5 

(d) 4.8

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1 Answer

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Correct answer is: (b) 4.6

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Mid-value of 10-15 is  (a) 10  (b) 12.5 
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