Q. The mean weight of 9 items is 15. If one more item is added to the series, the mean becomes 16. The value of 10th item is
A) 35
B) 30
C) 25
D) 20
Explanation
(c)
Total weight of 9 items $= 15 \times 9 = 135$
And total weight of 10 items $= 16 \times 10 = 160$
$\therefore$ weight of 10th item $= 160 - 135 = 25$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.