On a test that has a normal distribution, a score of 64 falls one standard deviation below the mean, and a score of 70 falls one standard deviation above the mean. Determine the mean of this test.

(x+3)(x+7)

step-by-step explanation:

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 %

step-by-step explanation:

yes it represnts a functio, their are not 2 of the same numbers on the both sides