A scientist models the number of grams of a radioactive substance with the expression 15. (2)/5, where d is the number of days since the sample was measured.

1. After 20 days, will there be more or less than 1 gram of the substance left? Explain your reasoning

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 %