Select all of the ratios that are equivalent to 1:5. 6:30 5 to 20 8 to 40

6:30 and 8 to 40 are equivalent to 1:5

Step-by-step explanation:

Ratios can be rewritten to fractions where you can do the butterfly method.

1/5 and 6/30 would be equivalent because 30 x 1 is 30 and 5 x 6 is 30

1/5 and 8/40 would be 40 x 1 and 5 x 8

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! )

47

step-by-step explanation: