can someone please help me on this? our lesson is about summation notation.

Please do include the formula/solution that you use. Step by step. so that i can understand it. Thank you so much.

if the picture is unclear. Please do let me know.

Given that: X1 = 3 , X2 = 7 , X3 = 0 , X4 = 2 , and X5 = -3 1. 5 2. 5 3. 2 5 4. 5 5. 5 Xi X 2 Xi ( x 1 - 2) 2 5( x1 + 5) 2 i=1 i=1 1=3