Question 868940
Note that a - d are mutually inclusive events and e is mutually exclusive events
a) 1 - 4/5 = 1/5 probability of waking up too late to reach the road before 7.00 a.m.
b) 4/5 * (1 - 1/10) = 36/50 = 18/25 probability of waking up early and crossing the road in safety
c) (1 - 4/5) * (1 - 3/4) = 1/20 probability of waking up late and crossing the road in safety 
d) probability of waking up early and being run over = 4/5 * 1/10 = 4/50 = 2/25
e) probability of crossing the road in safety = 18/25 + 1/20 = 72/100 + 5/100 = 77/100