The taxi and takeoff time for commercial jets is a random variable x with a mean of 8.7 minutes and a standard deviation of 2.9 minutes. assume that the distribution of taxi and takeoff times is approximately normal. you may assume that the jets are lined up on a runway so that one taxies and takes off immediately after the other, and that they take off one at a time on a given runway. what is the probability that for 33 jets on a given runway, total taxi and takeoff time will be less than 320 minutes?

What is the reflection image of (5,-3) across the line y = -x?

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

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.