Question

a woman is expecting triplets. What is the probability that there are 2 girls and 1 boy? What is the probability that all 3 babies are girls?

Answer 1

Ask yourself: Does this sound like a problem in binomial probability? Why?
What is n? What constitutes a "success"?

Answer 2

n is an x chromosome and what's a success?

Answer 3

:)

Why don't we just say that a "success" is the birth of a girl? Then a "failure" would be the birth of a boy, right? :) :) But look: I'm just trying to clarify what I think this problem is asking for.

What conditions are / are not met here? If Baby #1 is a girl, does that affect whether or not Baby #2 is a girl or boy?

Answer 4

How many "trials" are there?
What is the probability of "success"?

Answer 5

@mathmale yeaaaa
Girls are the success :)

Answer 6

@blacklabel : OF COURSE! What else could a girl be? :)

Answer 7

@mathmale are you a girl? ...&what..? lol

Answer 8

Ladies and gentlemen, let's focus on solving Mhm120's MATH problem. Pretty please.

Answer 9

@Mhm120 n would not equal the x chromosome to be honest although I do see where u r coming from
n would be the total amount of babies which in this case the total amount of babies is 3 since the woman is expecting triplets

Answer 10

Exactly. The lady's expecting triplets, so the number of trials is 3. Right on.

Answer 11

What is the probability that the woman will have a girl
Obviously the probability is a 1/2 since for each baby its a 50% chance it will be a girl and 50% chance it will be a boy

Answer 12

@Mhm120 : Awaiting your input! Could you perhaps summarize what you know about this problem now and what you need to learn/find to solve it? BlackLabel just got a medal for identifying n and the probability of "success."

Answer 13

Before we move forward: What kind of probability distribution is this, anyway? (What's its name?)

Answer 14

I kinda get it..

Answer 15

distribution?

Answer 16

I'm glad. Is this normal probability? binomial probability? uniform probability?

Answer 17

um binomial probability

Answer 18

Sometimes we have to move forward even when not 100% sure we're on the right track. Go ahead: Summarize what you know already and what you need to know to solve the problem. I would use binomial probability myself.

Answer 19

sorry.. I'm really tired..so I'm slow

Answer 20

Summarizing:
n = 3
p of success = .5

Have you calculated binomial probability before? If so, was it using a binomial probability distribution table, or was it using a calculator such as the TI-83 or -84?

Answer 21

Could youI have to go for a while, to finish other stuff. Could you please continue and i'll come back and see if I understand it. If I don't i'll make sure to message you and let you know.

Answer 22

Of course. But first, would you please tell me whether you've found binomial probabilities before from (1) A TABLE or (2) a TI calculator?

Answer 23

No I haven't

Answer 24

Umm you can calculate this easily with the binomial distribution formula