The file P08_23.xlsx contains data from a survey of 500 randomly selected households. a. Separate the households in the sample by the location of their residence within the given community. For each of the four locations, use the sample information to calculate a 90% confidence interval for the mean annual income (sum of first income and second income) of all relevant households. Round your answers to the nearest whole dollar, if necessary.

Total income SW Sector NW Sector NE Sector SE Sector
Lower Limit $
$
$
$

Upper Limit $
$
$
$

then, the surface area of the sphere shown in the image is: 256π sq. units!

step-by-step explanation:

the lateral surface area of a sphere is 2πrh where h=2r.

then:

surface area = 4πr^2.

in this case, r=8 units ⇒ surface area = 4π(8 units)^2. = 256π sq. units!

then, the surface area of the sphere shown in the image is: 256π sq. units!

3

step-by-step explanation:

graph b

step-by-step explanation:

one solution- graph a (clear intercepting point.)

no solution- graph b (they're parallel, there will never be a point of interception.)

infinite solutions- graph c (all points intercept.)

55 degrees because 55+55=110 degrees