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47. The mean of ages of 30 girls is 14 years. 5 girlswith mean ages of 15 years left the class. Themean of ages of remaining girls will be(A) 9 years(B) 14 years(C) 12.8 years (D) 13.8 years |
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Answer» Mean age of 30 girls is 14 years.Hence, sum of ages of 30 girls= 30×14= 420.5 girls with mean age of 15 years have left.So, remaining sum = 420 - (15×5)= 420 -. 75= 345.Remaining no of girls = 30-5=25So, new mean age = Remaining sum/ Remaining girls= 345/25= 13.8 yearsHence, correct option is (D) yes d is the correct answer option D is used answer |
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