1.23 Example

Given

\(f_1=2, f_2 = 4, f_3 = 6\)

\(x_1 = -3, x_2 =7, x_3 = 4\)

Find the values of

  1. \(\sum f_ix_i\)
  2. \(\sum f_ix_i^2\)
  3. \(\sum f_i(x_i-5)^2\)