A landscaper is hired to build a stone wall to support a gently sloping yard. The bottom row will require 83 stones placed horizontally. Each row needs four fewer stones than the layer below. The top of the stone wall is shown. How many stones will the landscaper need?

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 %

y/x of point b= y/x of point a

step-by-step explanation:

(i got the same question, this was the correct answer.)

there were a lot of them but the first one to pop up on a google search was bts