anonymous
  • anonymous
a family has 5 children. the probability of having a girl is 1/2. what is the probability of having no girls?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
suppose you have a coin. what is the probability of it landing heads?
anonymous
  • anonymous
ok i know the answer to the question is .0313, anyone know how?
anonymous
  • anonymous
see if 1/32 is 0.0313

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anonymous
  • anonymous
yeah how did you get 32
anonymous
  • anonymous
the probability of having a girl is 1/2. so the probability of having a boy is 1/2. in a family of 5 children, all are boys. i.e, there are no girls. so the parents had five boys consecutively. so the probability of having 5 boys in a row is 1/2 times 1/2 times 1/2 times 1/2 times 1/2
anonymous
  • anonymous
ok thanks, know how to get this one? a bag contains 6 cherry, 3 orange, and 2 lemon candies. you reach in and take 3 pieces of candy at random. find the probability you with pick 2 cherry and 1 lemon
anonymous
  • anonymous
yes, but do you want the answer or do you want to learn how to do this?
anonymous
  • anonymous
learn how, i know the answer
anonymous
  • anonymous
okay. so suppose you have 2 candies in the bag. one is lemon and one is grape. what is the probability that you will pick the lemon candy?
anonymous
  • anonymous
1/2
anonymous
  • anonymous
okay good. suppose you have three candies. one lemon one grape and one cherry. what is the probability you pick the lemon ?
anonymous
  • anonymous
1/3
anonymous
  • anonymous
okay good. suppose you have three candies, two lemon and one cherry. what is the probability you pick a lemon candy?
anonymous
  • anonymous
2/3
anonymous
  • anonymous
okay very good. now you have 6 cherry, 3 lemon and 2 grape candies. what is the probability that you pick one cherry candy?
anonymous
  • anonymous
6/11
anonymous
  • anonymous
okay very good. now, you have already picked one candy. so there are ten candies left. 5 cherry, 3 lemon and 2 grape. what is the probability that you pick a cherry candy?
anonymous
  • anonymous
5/10 so 1/2
anonymous
  • anonymous
yes, good. now there are 9 candies left. 4 cherry, 3 lemon and 2 grape. what is the probability that you pick a lemon candy?
anonymous
  • anonymous
3/9, and then you multiply right? thats how i tried to solve the original one but i got the wrong answer
anonymous
  • anonymous
yes, so the probability that you pick 2 cherry candies in a row and then one lemon candy is 6/11 times 1/2 times 1/3.
anonymous
  • anonymous
for 6 cherry, 3 orange, and 2 lemon; the prob of 2 cherry and 1 lemon: answer is supposed to be .1818
anonymous
  • anonymous
solving its that way gets .0909
anonymous
  • anonymous
the question says there are only 2 lemon candies and there are 3 orange candies. so for the third try, you pick a lemon candy out of 9 candies, the probability of that is 2/9 so the answer should be 6/11 times 1/2 times 2/9
anonymous
  • anonymous
yeah i can do that and get .0606; but the book says the answer is supposed to be .1818
anonymous
  • anonymous
thats why im confused
anonymous
  • anonymous
wait, is that supposed to be in that order?
anonymous
  • anonymous
it says at random
anonymous
  • anonymous
yeah it says random, but is the expected answer 1 cherry then 1 cherry then 1 lemon or is it that you pick three candies and you end up with 2 cherries and 1 lemon?
anonymous
  • anonymous
okay looks like you are not reaching in three times. you just reach in once and take three candies.
anonymous
  • anonymous
it says "you reach in and take 3 pieces of candy at random"
anonymous
  • anonymous
do you know how to figure it out that way?
anonymous
  • anonymous
yeah. you have to do it the following way: 6C2/11C3 times 2C1/11C3
anonymous
  • anonymous
c?
anonymous
  • anonymous
have you done permutations and combinations? BTW ignore my answer. that is incorrect. I will calculate the correct answer and post it here.
anonymous
  • anonymous
my teacher gave us problems to do but never taught us how, but yes we are supposed to be doing permutations and combinations. any quick formulas i can jot down for the test?
anonymous
  • anonymous
The answer is 6C2 times 2C1 divided by 11C3
anonymous
  • anonymous
ohh ok that makes sense! thanks!
anonymous
  • anonymous
so that is 15 times 2 divided by 165 = 30/165 = 0.181818181
anonymous
  • anonymous
you dont know how to do combinations?
anonymous
  • anonymous
nope:(
anonymous
  • anonymous
then how did it make sense to you?
anonymous
  • anonymous
she showed us the calculator commands for the c but didnt show us what it was for, now i know
anonymous
  • anonymous
http://www.mathsisfun.com/combinatorics/combinations-permutations.html
anonymous
  • anonymous
read through that and ask me if you have doubts.
anonymous
  • anonymous
thanks soo much!
anonymous
  • anonymous
probability in poker, a flush in any suit?
anonymous
  • anonymous
what is your question?

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