A contractor records the areas, in square feet, of
several houses in a neighborhood to determine
data about the neighborhood. Which formula
should be used to calculate the standard
deviation?
2
(x1 - x)2 + (x2 - x)2 +...+(Xx - x)2
n-1
S=
(x1 - x)2 + (x2-x)+ +(Xy - x)?
n-1
02
(*– 4)2+(12-4)2 + ... + (min-)?
N
(x2 - 1)2+(12 - 4)2 +...+(\n - 4112
JE
N

50 ! pls ! 12.  building codes regulate the steepness of stairs. homes must have steps that are at least 13 inches wide for each 8 inches that they rise.

a. discuss how to find the slope of the stairs.
b. describe how changing the width or height affects the steepness of the stairs.

Isuck at math ; ^; m a student solved this problem and said the answer is 3 feet. chase had a roll of ribbon that contained 7 7/8  feet of ribbon. he cut off one piece that was 3 5/8  feet long and another piece that was 1 1/4  feet from the roll. how much ribbon was left on the roll? is the student's answer reasonable? yes, the answer is reasonable. no, the answer is not reasonable. it should be about 2 feet. no, the answer is not reasonable. it should be about 13 feet. no, the answer is not reasonable. it should be about 4 feet.

What does the sign of the slope tell you about a line?