Question 8 of 10 What does it mean to be a unit of account?
A. Any item can be traded for another item
B. it serves as a valid currency
C. the item is divisible and each unit is worth the same
D. Any item that maintains it’s worth overtime

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.

How can writing phrases as algebraic expressions you solve problems?

Change negative exponents to positive, then solve