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Question 2 of 14
Question 2
10 points
Glendah attends a school in Modesto, CA. The probability that Glendah enrolls in a math class is 2 and the probability that she enrolls in a speech class is .75. The probability
that she enrolls in a math class GIVEN that she enrolls in speech class is 25. Let M = math class, 5-speech class, and MIS = math given speech.
**Round to four decimal places
a. What is the probability that she enrolls in math and speech?
Find PM AND 5) - PUM|S9PUS).
b. What is the probability that she enrolls in math or speech classes?
Find PUMOR 5) = P(M) + PLS) - PM AND 5).
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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! )

step-by-step explanation: