Questions on Firing & bomb

A bomb is dropped from an aeroplane moving horizontally at constant speed. When air resistance is taken into consideration, the bomb

If the probability that a bomb will hit a target is 60% and if 10 bombs are dropped then find mean and variance.

Assertion (A) : Hydrogen bomb is more powerful than atomic bomb. Reason (R) : In hydrogen bomb, fusion reaction is initiated.

The probability that a bomb dropped on a bridge hitting it is 0.5. Eight bombs are dropped on the bridge.The bridgewill be destroyed if any two bombs fall on it.Find the probability that: i ) All bombs hit the bridge