Average

To solve the problem, we need to find the new average after removing one number from a group of 11 numbers whose average is 10.5.

1. Calculating the Total Sum of 11 Numbers:
Average = Total Sum / Number of items
So, Total Sum = Average × Number of items =

2. Subtracting the Deleted Number:
One of the numbers is 9, which is deleted.
New Total Sum =

3. Calculating the New Average:
Now, there are 10 numbers remaining.
New Average = Total Sum / Number of items =

Final Answer:
The new average of the remaining numbers is 10.65.