A sampling of 20 inpatients in Hospital X's intensive Care Unit revealed an average lenght of stay of 3.5 days with a standard deviation of 0.5 days. Construct a 95% confidence interval to show what values the true population length of stay falls between.

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.