In a bucket there are 4 balls - one each of red, blue, green and yellow. You must choose one at random. What are the odds you will never pick the green one?

15 points ! ~ see if you know the answer to both you!

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.

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a