Find the missing element in the following base-rate-percentage problem.

what percent of 621 is 300?

a)48.31%
b)0.483%
c)2.07%
d)20.71%

A. 48.31%

Step-by-step explanation:

We are asked to find 300 is what percentage of 621.

To find 300 is what percentage of 621, we will divide 300 by 621 and multiply the result by 100%.

Therefore, 300 is approximately 48.31% of 621 and option A is the correct choice.

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! )