Acontractor 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?

Step-by-step explanation:

Given that a contractor records the areas,  in square feet, of several houses in a neighborhood to determine data about the neighborhood.

Let X1, X2,...Xn be the data set

We find mean of this by the formula sum/n

Mean =

Now variance is calculated as sum of squares of deviations of each entry from this mean.

Var(x) =

Standard deviation = square root of variance

Thus first mean, then variance then sd deviation is calculated.

The answer is B on edge

Step-by-step explanation:

The second answer is A: The data is a sample and is expected to be more dispersed from the mean.

option 2 is correct.

step-by-step explanation:

we are given two inequality equation

x+y> 5 and -3x+2y< -2

first we draw the graph of both function using t-table method

equation: x+y> 5

for x=0, y=5

for x=-5, y=0

table:

x   :   0     5

y   :   5     0

test point (0,0) , 0> 5

false

equation: -3x+2y< -2

for x=0, y=-1

for x=2, y=4

table:

x   :   0     2

y   : -1       4

test point (0,0) , 0< -2

true

now we draw the graph. see the attachment for graph.

common region would be solution set.

option 2 is correct.