Question

23 security systems a home security system is designed to have a 99% reliability rate. suppose that nine homes equipped with this system experience an attempted burglary. find the probabilities of these events:
a. at least one of the alarms is triggered.
b. more than seven of the alarms are triggered
c. eight or fewer alarms are triggered.

Answer 1

C. eight or fewer

99% means 99/100

. with 9 alarms there is no way you can trigger 8 alarms with that 99% rate