Mathematics

Guest

5 August, 11:12

A contractor records the areas, in square feet, of a small sample of houses in a neighborhood to determine data about the neighborhood.

They are:

2,400; 1,750; 1,900; 2,500; 2,250; 2,100

Which of the following represents the numerator in the calculation of variance and standard deviation?

(225) 2 + (-425) 2 + (-275) 2 + (325) 2 + (75) 2 + (-75) 2 = 423,750

(650) 2 + (-150) 2 + (-600) 2 + (250) 2 + (150) 2 + (-300) 2 = 980,000

(250) 2 + (-400) 2 + (-250) 2 + (350) 2 + (100) 2 + (-50) 2 = 420,000