HELP ME PLZ Marta has a bag of 10 orange blocks and 10 purple blocks she selected a block with out looking and return it to the bag she repeats this 20 times ( which charts show result that are most likely )

Find the equation of the trend line (line of best fit). show your work i'm using the points (34,76) (42,91)

Which simplifys to a+ b? a-(1-b)+1 -(1-a)-b+1 (a--1) -1)+1

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.