Alejandra has $600 in her checking account. She wants to spend part of this money
computer. She wants to have at least $250 left in her checking account after buying
computer. The inequality shown can be used to find t, the amount of money in dollars to
Alejandra can spend on the computer.
t +250 S 600
Which Inequality represents all possible values of t?

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.