Question

calculate the sum $sum (x - \bar{x})(y - \bar{y})$.

Explanation:

Step1: Calculate first product

$(-6.3)(-101.36)=638.568$

Step2: Calculate second product

$(-3.3)(-60.66) = 199.178$

Step3: Calculate third product

$(-0.3)(22.64)=-6.792$

Step4: Calculate fourth product

$(3.2)(56.44)=180.608$

Step5: Calculate fifth product

$(6.7)(82.94)=555.698$

Step6: Calculate the sum

$638.568+199.178 - 6.792+180.608+555.698 = 1567.26$

Answer:

$1567.26$