Buses were observed for their tardiness. Only 5 out of 100 buses were tardy, the rest were not.

a) estimate p(on time)

b) if 4 buses are picked randomly, estimate p(no tardy)

c) if 4 buses are picked randomly, estimate p(exactly 1 tardy)

d) calculate the uncertainty of each p in (a), (b), and (c)

Please solve each clearly