1.) 500 flights land each day at San Jose's airport. Assume that each flight has a 5% chance of being late, independently of whether any other flights are late. Using Excel, calculate the probability of the following events. Turn in your spreadsheet.

a) 15 or fewer flights are late.

b) 30 or more flights are late.

c) Exactly 26 flights are late.

d) Between 10 and 20 flights are late.

e) Does our assumption of independence seem reasonable to you? Why or why not?