Answer:
B because I know and smart smarting
and smart
Let
denote the number of packages brought by customer
. If, for instance,
customers are in line, then the total number of packages is
, and

since the number of packages brought by any customer is independent from the number of packages brought by any other.
a.
is the probability that a total of 3 packages are waiting to get wrapped from among a total of 3 customers. This means each customer must have exactly one package. So

b.
is the probability that a total of 11 packages are brought by 4 customers. The only way for there to be 11 packages is if 3 customers bring 3 packages and the last 1 brings 2. There are
ways this can happen, so

Answer: x=2.9, y=-1.6 and x=-1.7, y=6.7
PLEASE MARK ME AS BRAINLIEST
4(6)-6(3)+(8)
24-18+8
6+8
14