Joe is organising a quiz night. He has to work out how big the teams should be.
There will either be 36 or 44 contestants.
What is the greatest number of people Joe
can put in each team?

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.

Which of the following best describes the figure?

With alll of except for the 2 that i did already