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In a tuition class, there were 15 students. Average marks was 46. Average marks of 7 students was 42. Find the average marks of 8 students.1. 50.52. 49.53. 31.64. 17.5 |
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Answer» Correct Answer - Option 2 : 49.5
Given Number of students = 15 Average marks scored by 15 students = 46 Average marks scored by 7 students = 42 Concept Average = Sum of all observation/ Number of observation Calculation Total marks scored by 15 students = 15 × 46 = 690 Total marks scored by 7 students = 7 × 42 = 294 Total marks scores by 8 students = 690 - 294 = 396 Average marks scored by 8 students = 396/8 = 49.6
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