In a precision bombing attack there are 50% chance that any one bomb will strike the target. Two direct hits are required to destroy the target completely. How many bombs must be dropped to give a 99% chance or better of completely destroying the target?

A car hire firm has 2 cars which it sends out day by day. The number of demands for a car on each day is distributed as Poisson variate with mean 1.5.

calculate the proportion of days on which some demands are refused.

please explain to me how you proceed for each question

thank you loads