Elly's hot dog emporium is famous for its chilidogs. Some customers order the hot dogs with hot peppers, while many do not care for that added bit of zest. Elly's latest sales indicate that 50% of the customers ordering her chilidogs order it with hot pepper. Suppose 16 customers are selected at random.

1,What is the probability that exactly ten customers will ask for hot pepper?

2,What is the probability that 12 or 13 customers will want hot pepper?

3, How many chili dogs would Elly's expect to have hot pepper?

4,What is the standard deviation of the distribution of chili dogs with hot peppers?

Please show tree diagram and calculation, Thank you!