You are given an urn with 100 balls (50 black and 50 white). you pick balls from urn one by one without replacements until all the balls are out. a black followed by a white or a white followed by a black is "a colour change". calculate the expected number of colour changes if the balls are being picked randomly from the urn.

Chosen according to the volume of oil it can haul, as shown in at a railway yard, locomotives are used to haul containers carrying the table. locomotive capacity a450 0 -750 cubic feet cg35 750-1,500 cubic feet br73 1,500-2,500 cubic feet yh61 2,500-3,500 cubic feet & the four cylindrical containers listed in the table need to be hauled. cylinder length (ft.) diameter (ft.) fill level a 40 , 12 half b 24 8 full c 16 16 full 6 12 full d match each container to the locomotive needed to haulit a450 cylinder a yh61 cylinder d