I really need some help with these two questions

See below.

Step-by-step explanation:

2.  2.5 pounds of coffee will cost 2.5 * 2 = $5

3.  Lee earns $49.40 for 6.5 hours.  49.40 / 6.5 = $7.60/hour.  For 25 hours, she earns 25 * 7.60 = $190.

the answer   is 200

step-by-step explanation:

this is a problem about poisson probabilities.   i don't know if you've

already studied poisson distributions, or if you have a place to look

to read more about the subject.  

here's how you can see a poisson distribution coming.   when there are

a lot of events that may happen at any time (or any place), and when

you're counting how many of them happen at a particular time (or a

particular place), and each event is independent of the others, then

the result is a poisson distribution.   this is roughly true for the

chocolate chips; one chip being in a cookie has only a small effect on

the probability that another chip will be in the cookie.

once you know you have a poisson distribution, you know a lot.   there

is only one parameter to a poisson distribution, so if you know the

mean, you know everything.   the form of the distribution is

  probability of n chips = {[e^(-x)]*(x^n)} / (n! )

0 is its x and y coordinate