1.The 2018 statistics shows that the average life expectancy of females in Canada has risen to 83.9 years. Assuming the standard deviation of their life expectancy was 7.4 years, determine the minimum percentage of females in Canada whose life expectancy was between 75.02 and 92.78 years.

2.A home security company claims that the reliability rate of their home security system is 90%. If sixteen homes are equipped with this system experience an attempted break-in, what is the probability that no more than three alarms are triggered?