А
D
(у + 20)°
(3х + 5)
E
(4у – 15) \(х + 15)°
Ск
B

今年广东二B批次院校共录取考生9万人。从录取情况来看，今年二B录取延续了一本及二A本科录取的“热度”，考生填报二B院校尤其是省内院校的积极性较高，填报的志愿也更趋合理，更多的考生如愿进入本科院校学习，更多的民办院校和独立学院获得了充足的生源。从二B文科来看，对比2014年 ..

Step-by-step explanation:

А

D

(у + 20)°

(3х + 5)

E

(4у – 15) \(х + 15)°

Ск

B

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! )

75

step-by-step explanation: