On a recent glider flight, Lucy took a tow to 3000 feet above ground level. She found a good thermal draft and climbed 1800 feet higher.
Then she hit a big gap and lost 2250 feet.
What was her altitude at that point?
A 2600 feet
B.
2550 feet
-2600 feet
D
-2550 feet

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.