Question

Halp I'm already in calculus even I'm still in grade 7...​

Answer 1

• See below

Explanation:

This is about sums.

Use the numbers in the table to find respective sums.

1. Sum of all fi

• ∑fi = 3 + 5 + 7 + 8 + 12 + 10 = 45

2. Sum of all xi

• ∑xi = -2 + 5 + 4 - 3 + 7 + 6 = 17

3. Sum of all yi

• ∑yi = 3 + 3 - 7 + 2 - 5 - 1 = - 5

4. Sum of fi*xi

• ∑(2 to 4)fi*xi = 5*5 + 7*4 + 8*(-3) = 29

5. Sum of (xi + yi)

• ∑(1 to 3)(xi + yi) = (-2 + 3) + (5 + 3) + (4 - 7) = 6