Twyla's pet cat weighs 8lb. her pet hamster weighs 12 ounces. what is the ratio of her cat's weight to her hamster's weight? ratio without conversion or simplifying: ratio after converting to the same units: ratio after simplifying:

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.