Question

Average marks of 10 students is 60. Marks of two students were altered as 50 instead of 40 and 30 instead of 40 the new age is

Answer 1

Total marks of 10 failed students = 28 x 10 = 280 

and total marks of 50 students = 2800 

Therefore, Total marks of 40 passed students . 5 = 2800 - 280 = 2520 

Therefore, Average marks of 40 passed students = 252040=63

Answer 2

initiatially,average marks of 10 students

= 60

total marks = 10 × 60 = 600

initially, marks of two students was
40, 40 .

sum of 2 students' marks

= 40 + 40 = 80

after alteration,

their marks

= 50, 30


sum = 50 + 30 = 80


difference = 80 - 80 = 0


so ,average marks of all the students will remain same as it was before

average marks = 60



Answer: average marks = 60 marks