Trey made a scale drawing of a microchip using a scale of 2 inches to 1 centimeter. His drawing was an enlargement that depicted
the chip as 6 inches long and 4 inches wide. However, the drawing isn't big enough to clearly show all of the chip's components. So
he wants to make the drawing larger.
Complete the steps below to figure the dimensions of the scale drawing if Trey changes the scale to 3 inches to 1 centimeter.
Part A
What is the actual length of the microchip?

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.