The deer population in a national park is expected to decline over time. The park ranger started a research study, and at the end of the first year there were 800 deer in the park. The park ranger anticipated the population would reduce by 50% each year.

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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,

but, we know that,

which is the required equation that will use to find the probability of a late departure or an early departure.

therefore,   the probability of a late departure or an early arrival =   35 %