A total of 18.6 cu yd of concrete is required for pouring a foundation. The ratio of cent to sand the graval for this aplication is 1:2:4,and the amount of these components must be 1 1/2 times tje volume of concrete needed. How many cubic yards of each component are needed.

35-60 students are taking math.

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 %