answer: 35 % is the probability of a late departure or an early arrival.
step-by-step explanation:
let l represents the late departure and e represents the early departure.
then, according to the question,
p(l) = 12 %, p(e) = 27 % and
= 4 %
and, we have to find out, ![p(l\cup e)](/tex.php?f=p(l\cup e))
but, we know that,
![p(l\cup e)= p(l) + p(e) - p(l\cap e)](/tex.php?f=p(l\cup e)= p(l) + p(e) - p(l\cap e))
which is the required equation that will use to find the probability of a late departure or an early departure.
![p(l\cup e)= 12 + 27 - 4](/tex.php?f=p(l\cup e)= 12 + 27 - 4)
![p(l\cup e)= 35 %](/tex.php?f=p(l\cup e)= 35 %)
therefore, the probability of a late departure or an early arrival = 35 %