Johnny has 90, 84, and an 86 on his first 3 tests. what score would he need to make on the 4th test to bring his test average up to a 90

283 square feet

step-by-step explanation:

good luck

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 %