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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.

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