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The average weight of 20 students is 25 kg. By the admission of new student the average weight is reduced to 24.8 Kg. The weight of new student is :1). 15 Kg2). 20.8 Kg3). 29 Kg4). 22 Kg |
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Answer» We KNOW that, Average weight = (SUM of weight of all students)/(Total no. of students) Initially, total NUMBER of students = 20, and Average weight = 25 Kg ∴ Sum of weight of all students initially = 20 × 25 = 500 Kg Let the weight of new STUDENT be X Kg. Then, ⇒ New sum of weight of all students = (500 + X) Kg Given: Average weight after entry of new student = 24.8 Kg $(\therefore 24.8 = \frac{{500 + X}}{{20 + 1}})$ ⇒ X = 20.8 kg |
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