Sami invited 85 person to his backyard party, he has many games for the visitors so they can enjoy the party. One of the games is "spin and win" , 19 visitors played the game but Sami will pick randomly 5 winners at the end of the day. Identify the number of population and sample for those who played the "spin and win" game.

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.

What’s the range cuz i can’t find it?

How much would it be worth in 5, 10, 20 years