To calculate (ΣX)², you first need to find the sum of the values (ΣX) and then square that sum.
The values you provided are 1, 3, and 5. To find ΣX (the sum of these values), you simply add them together:
ΣX = 1 + 3 + 5 = 9
Now that you have ΣX, you can square it:
(ΣX)² = 9² = 81
So, (ΣX)² for the scores 1, 3, and 5 is 81.