There are several alternatives for alleviating so2 pollution from smokestacks in operations using coal as a major fuel source. one is to employ a scrubber that cleans the gases after the coal is burned prior to release. in 50 samples of gases emitted from a stack equipped with a scrubber, the sample mean and sample standard deviation so2 emissions were 0.13 and 0.05 ppm btu, respectively. construct a 95% confidence interval for σ2.

Simply 8x squared + 5(7x squared- x) - 2x =

Richard save $32 in march he saved $48 in april and $38 in may then richard spent $113 on a keyboard how much money does richard have left

Abag contains 3 red marbles, 2 blue marbles, and 2 green marbles. one marble is picked, then another marble. assume that the selections are made with replacement. a) find the probability of picking two red marbles with replacement. b) find the probability of picking a red marble and a blue marble. assume the selections are made without replacement. c) find the probability of picking two red marbles without replacement. d) find the probability of picking a red marble and a blue marble without replacement.