How many ipods shuffles will fit into the packing box

Use the normal approximation to the binomial distribution to answer this question. fifteen percent of all students at a large university are absent on mondays. if a random sample of 12 names is called on a monday, what is the probability that four students are absent?

You have 6 dollars +12 pennies +to quarters + 4 dimes=2 nickels how much do you have

Is a positive integer raised to a negative power always positive