ach box of Cal Crunch cereal contains a sticker. The sticker is equally likely to have one of the following five pictures on it, independently of the stickers in all other boxes: a walking bear, a sleeping bear, the Campanile, Sather Gate, Evans Hall Stat 88 GSIs love to snack on Cal Crunch so they buy a box each week and put the sticker in their collection. Find the expectation and SD of the number of weeks till their collection has all five kinds of stickers.