Suppose you draw 10 coins at random from the bag (assume each of the five coin types will come up with equal probability for each draw). What is the probability that you will be able to buy an item for $1.00?

Suppose you draw 10 coins at random from the bag (assume each of the five coin types will come up with equal probability for each draw)

is the standard deviation of the change you get back from the cashier when the item costs $0.25?