Thomas bought 2 tables and 8 chairs for rs. 21000 at same rate, mohan bought 3 tables and 10 chairs for rs. 28500 calcuate the cost of 1 table. calcuate the cost of 1 chair

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.