An assembly line worker recorded the number of different car parts he had to assemble per day on several different days. He
recorded the number of parts, x, during each day. The number
of people observed was normally distributed with a mean of
204 and a standard deviation of 18.6. Find the probability of
processing at least 230 parts during a day. Round your answer
to the nearest thousandth (using a z-score rounded to the
nearest tenth).
P=

Ahome improvement store rents it’s delivery truck for $19 for the first 75 minutes and $4.75 for each additional 1/4 hour. if a customer rented the truck at 11: 10 am and returned the truck at 1: 40 pm the same day, what would his rental cost be?

Asap! i'm not good math and i'm lost.

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.