Find the values of the expressions listed here- find

Question

Find the values of the expressions listed here:

a. Find Σ⁴_i=1 X_i for the scores X₁ = 3, X₂ = 5, X₃ = 7, X₄ = 10.

b. Find Σ⁶_i=1 X_i for the scores X₁ = 2, X₂ = 3, X₃ = 4, X₄ = 6, X₅ = 9, X₆ = 11, X₇ = 14.

c. Find Σ^N_i=2 X_i for the scores X₁ = 10, X₂ = 12, X₃ = 13, X₄ = 15, X₅ = 18.

d. Find Σ^N-1_i=3 X_i for the scores X₁ = 22, X₂ = 24, X₃ = 28, X₄ = 35, X₅ = 38, X₆ = 40.