To pass a course with an a grade a student must have an average of 90 or greater

average a 90 or greater

Step-by-step explanation:

Because if the student needed a 90 percent average to pass, anything lower than a 90 would mean he fails.

b) well because you get well

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 %