The nth term of an arithmetic progression is 2n+1 , the sum of 1st n terms of the Arithmetic progression is..

First tale nth term and find relation of a , d, n

Try yourself

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 %

15.36 per mile

but forgot to round

i am pretty sure