If cell range A1:A3 contains the numbers 5, 6 and 7, then =AVERAGE(A1:A3, 10)  will return __________*1 point671.818

The formula =AVERAGE(A1:A3, 10) in Excel calculates the average of the numbers in the cell range A1:A3 and the number 10. Here's how to calculate it step by step:

1. Add up the numbers in the cell range A1:A3 and the number 10. So, 5 (from cell A1) + 6 (from cell A2) + 7 (from cell A3) + 10 equals 28.

2. Count the total number of values. In this case, there are 4 values (three from the cell range and one standalone number).

3. Divide the sum by the count. So, 28 divided by 4 equals 7.

Therefore, =AVERAGE(A1:A3, 10) will return 7.