The combined area of the 3 windowpanes and frame shown below is 924 in.2. the frame is of uniform width. what is the side length, x, of each square windowpane? the image is of two rectangles one inside the other. inner rectangle is divided into three squares each having length x . the space between the two rectangles is 6 inch both in length and width. a. 10 in. b. 20 in. c. 15 in. d. 25 in.

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.