the automatic opening device of a military cargo parachute has been designed to open when the parachute is 200m above ground.

the automatic opening device of a military cargo parachute has been designed to open when the parachute is 200m above ground. Suppose opening altitude actually has a normal distribuion with mean value 200m and standard deviation 30m. Equipment damage will occur if the parachute opens at an altitude of less than 100m. What is the probability that there is equipment damage to the payload of at least one of finve independently dropped parachutes.