Question

10.
Arithmetic mean of marks (out of 25) scored by 10 students was 15. One of the student,
named Karishma enquired the other 9 students and find the deviations frond her marks are
noted as - 8, -6, -3, -1,0,2,3,4,6. Find Karishma's marks.​

Answer 1

Answer:

A.M=15×10=150,let "x"marks be Karishma.

x-8+x-6+x-3+x-1+x+x+2+x+3+x+4+x+5+x+6+x=150,10x-3=150,10x=153,

x=15.3