Common information for 1 thru 4

Of all the luggage handled by the airlines at JFK in the last 10 years, 5% was lost or stolen or damaged. For a randomly selected sample of 400 pieces of outgoing luggage at JFK International Airport

1. Would it be unusual for 10 pieces of luggage to be lost?
2. The mean and standard deviation of the binomial distribution is given by
3. Would 40 pieces of luggage lost be an unusual occurrence?
4. Find the probability that less than 6 pieces of luggage are lost or stolen.