AVERAGEThe average of the marks obtained in anexamination by 8 student

1.	AVERAGEThe average of the marks obtained in anexamination by 8 student was 51 and byother student was 68. The average marksof the 17 student is:(a) 59(b) 59.5(c) 60(d) 60.5
Answer» The average of mark obtained in an examination by 8 students was 51 Let total marks of 8 students be x Let total marks of other 9 students be y Then, x/8 = 51x = 518x = 408 the average of other 9 = 68y/9 = 68y = 689y = 612 Therefore, average marks of all 17 students = (x + y) /17= 1020 / 1= 60 Average marks of all 17 students = 60 marks (c) is correct option

AVERAGEThe average of the marks obtained in anexamination by 8 student was 51 and byother student was 68. The average marksof the 17 student is:(a) 59(b) 59.5(c) 60(d) 60.5

Answer»

The average of mark obtained in an examination by 8 students was 51

Let total marks of 8 students be x Let total marks of other 9 students be y

Then, x/8 = 51x = 51*8x = 408

the average of other 9 = 68y/9 = 68y = 68*9y = 612

Therefore, average marks of all 17 students = (x + y) /17= 1020 / 1= 60

Average marks of all 17 students = 60 marks