Statistics
Mean
MMTS_Full_Test_13
Grade 12
Question:
The mean weight of 9 items is 15. If one more item is added to the series, the mean becomes 16. The value of the $10^{\text{th}}$ item is
Step-by-Step Solution
Key Concept: New sum = old sum + 10th item
$160=135+a_{10}\Rightarrow a_{10}=25$.
Correct Answer: 25