Question

The average of 12 results is 15, and the average of the first two is 14.what is the average of the rest?

Answer 1

Step-by-step explanation:

If AM of 12 results is 15,

then sum of 12 results=15×12=180

if the AM of first two is 14,

then sum of the first two=14×2=28

then the sum of remaining 10 is(180-28)=152

AM of remaining 10=152/10=15.2

(or)

Average method

The average of 12 results is 15

sum of 12 results=15×2=30

average of the first two=14

sum of first two=14×2=28

sum of remaining 10 results=30-28=2

average of the remaining 10 results=2/2=1

Answer 2

Step-by-step explanation:

-2×1 + 10x =0

x = .2

average of 10 students = 15.2