Which variable is discrete?
number of rooms in house
size of house in square feet
length of house
temperature inside house

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

Someone me what is the area of this figure? 18m 18m 8m 16m

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.