Question 868940
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Hi
Interesting :) 
Before 7am: P(awake = 4/5 = .8), P(hit) = .10, P(hit after7) = .75
(a) the hedgehog waking up too late to reach the road before 7.00 a.m. {{{P = .2}}} 0r 20%
 (b) the hedgehog waking up early and crossing the road in safety {{{.8*.9 = .72}}}
 (c) the hedgehog waking up late and crossing the road in safety {{{.2*.25}}}
 (d) the hedgehog waking up early and being run over {{{.8*.1}}}
 (e) the hedgehog crossing the road in safety. {{{.8*.9 + .2*.25}}}