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Re: Nairaland Mathematics Clinic by Nobody: 12:10am On Sep 23, 2015 |
AnnieOakley:Absolutely. 2. The proportion of milk and water in 3 samples is 2:1, 3:2 and 5:3. A mixture comprising equal quantities of all 3 samples is made. What is the proportion of milk and water in the mixture? |
Re: Nairaland Mathematics Clinic by Nobody: 8:24am On Sep 23, 2015 |
Karmanaut: Thank you but how about the second one? I don't even know how to go about it. |
Re: Nairaland Mathematics Clinic by Nobody: 8:37am On Sep 23, 2015 |
In a primary school, 70% of the boys and 55% of the girls can ride a bicycle. If a boy and a girl are chosen at random, what is the probability that: (a) both of them can ride a bicycle [Is it 70/100 * 55/100 or 70/200 * 55/199 or neither?] (b) neither of them can ride a bicycle [Is it 30/100 * 45/100 or 1 - p(both can ride a bicycle)?] (c) if 150 boys are selected randomly in the school, what is the probability that they can ride a bicycle? [I did 70/100 * 150 = 105. p(both can ride = 105/150 = 7/10). Is it correct?]. Please help @jackpot, laplacian, antoinne, seamione |
Re: Nairaland Mathematics Clinic by Nobody: 10:04am On Sep 23, 2015 |
AnnieOakley:Sorry. Forgot. Proportion of milk in 3 samples is 2:3,3:5,5:8 Proportion of water in 3 samples is 1:3,2:5,3:8 Since equal quantities are taken, Total proportion of milk is 2/3+3/5+5/8=227/120 Total proportion of water is 1/3+2/5+3/8=133/120 Proportion of milk to water: 227:120 |
Re: Nairaland Mathematics Clinic by Nobody: 10:16am On Sep 23, 2015 |
AnnieOakley:I don't think the question is complete, as we weren't given a union of sets (considering the two events as sets) Normally we should have: P(A∪B)=P(A)+P(B)−P(A∩B). Where P(A) =70/100 = 7/10 and P(B) =55/100= 5.5/10 If there was a third set containing the percentage of students that can do both then the question is solvable. I could be wrong though. Will think through it later. |
Re: Nairaland Mathematics Clinic by Nobody: 1:15pm On Sep 23, 2015 |
Karmanaut: Thanks but why does water has a higher proportion value than water? |
Re: Nairaland Mathematics Clinic by Nobody: 1:15pm On Sep 23, 2015 |
Karmanaut: The question is complete. |
Re: Nairaland Mathematics Clinic by Nobody: 1:31pm On Sep 23, 2015 |
AnnieOakley:Error. It's actually the other way around. It should read: Milk to water:227:133 Both are over 120 (not relevant) |
Re: Nairaland Mathematics Clinic by Nobody: 2:19pm On Sep 23, 2015 |
Karmanaut: Thanks so much! |
Re: Nairaland Mathematics Clinic by Nobody: 2:57pm On Sep 23, 2015 |
Pls, I need help on where I can download Advanced Engineering Mathematics by H.K Dass Thank You |
Re: Nairaland Mathematics Clinic by 2nioshine(m): 5:20pm On Sep 23, 2015 |
AnnieOakley:I don't totally agree with your answer on your previous question. Maybe you should have considered the 28% of the acid mixture attached to the 300ml something like this Ratio of both acid mixture: 2 : 4 Hence you get 2/6(300*28/100) And 4/6(300*28/100) NB:The total shouldn't up to 300ml since the acid of the total mixture is just 28% (from a chem engr approach of mat bal tho) but for this; (a)Total % of students=100% Total% of boys who can ride=70% Total % of girls who can ride=55% Thus Applying the relation P(AUB)=p(A) + p(B) - P(AnB) p(AnB)=0.25 or 25% (b)for neither; Use 1-(probability of both) hope it helps |
Re: Nairaland Mathematics Clinic by Misanthrope: 8:33pm On Sep 23, 2015 |
Greetings. |
Re: Nairaland Mathematics Clinic by Misanthrope: 2:36am On Sep 24, 2015 |
A man spent 1/4 of his monthly salary on rent, 2/5 on food and 1/6 on his children's education. What fraction of his salary is left.? Show all your works. |
Re: Nairaland Mathematics Clinic by Nobody: 6:08am On Sep 24, 2015 |
Misanthrope:Total fraction =1. Add all the fractions and subtract from 1 to get the answer. |
Re: Nairaland Mathematics Clinic by Nobody: 7:39am On Sep 24, 2015 |
2nioshine: Why add when the question says 'both'? |
Re: Nairaland Mathematics Clinic by 2nioshine(m): 8:54am On Sep 24, 2015 |
AnnieOakley: where exactly?.....specify pls |
Re: Nairaland Mathematics Clinic by Olaxtra: 10:41am On Sep 24, 2015 |
Great tread!!! Thumb up guys |
Re: Nairaland Mathematics Clinic by Nobody: 12:35pm On Sep 24, 2015 |
2nioshine: I mean I was expecting something like p(A) * p(B) in the working. |
Re: Nairaland Mathematics Clinic by Nobody: 12:55pm On Sep 24, 2015 |
any whatsapp number/ group for this indispensable thread need helps, taking Utme 2016, (complex probability& integration & permutation and combination) Any number please? Mine is 0708-507-8800 |
Re: Nairaland Mathematics Clinic by agentofchange1(m): 4:00pm On Sep 24, 2015 |
hmmmm greetings #justing.passing.by |
Re: Nairaland Mathematics Clinic by Geofavor(m): 7:33pm On Sep 24, 2015 |
agentofchange1:Lol. Ur signature is funny. o posted a question in that maths thread. you guys didn't solve it. diarisgodo |
Re: Nairaland Mathematics Clinic by Nobody: 7:57pm On Sep 24, 2015 |
In his pocket a boy has 3 red marbles, 4 blue marbles and 4 green marbles. How many will he have to take out to ensure that he has taken out at least one of each colour? I got 9, i.e. 4 blue + 4 green + 1 red. Correct? @2nioshine, karmanaut, laplacian, agentofchange1 |
Re: Nairaland Mathematics Clinic by Olaxtra: 9:18pm On Sep 24, 2015 |
AYOBAMEE911: Mine's +2348101213004 |
Re: Nairaland Mathematics Clinic by Geofavor(m): 11:08am On Sep 25, 2015 |
Olaxtra:is there a group? |
Re: Nairaland Mathematics Clinic by Nobody: 1:18pm On Sep 25, 2015 |
AnnieOakley:I neither understand the question nor your answer. Is it a random sample? Does the boy know the color he's going to pick? Or is it a question under probability? |
Re: Nairaland Mathematics Clinic by Nobody: 1:27pm On Sep 25, 2015 |
Karmanaut: The marbles are picked at random. |
Re: Nairaland Mathematics Clinic by Nobody: 8:23pm On Sep 25, 2015 |
AnnieOakley:The answer is 9. You're correct. |
Re: Nairaland Mathematics Clinic by Nobody: 8:26pm On Sep 25, 2015 |
I have a weird question If you choose an answer at random, what is the chance that you will be correct? A) 25% B) 50% C) 60% D 25% |
Re: Nairaland Mathematics Clinic by Nobody: 8:29pm On Sep 25, 2015 |
Karmanaut: Thanks. It looked so simple so I began to wonder if something grandiose was expected from me. |
Re: Nairaland Mathematics Clinic by Nobody: 8:36pm On Sep 25, 2015 |
AnnieOakley:At first I was confused: the questioning didn't say it was a random sampling so I thought, why doesn't the guy just take one of each? That would make the answer 3. 1 Like |
Re: Nairaland Mathematics Clinic by Nobody: 9:06pm On Sep 25, 2015 |
Karmanaut: If the correct answer is 25%, then that gives a 50% chance of correctness. Each of the others have a 25% chance of being correct. |
Re: Nairaland Mathematics Clinic by Nobody: 9:40pm On Sep 25, 2015 |
AnnieOakley:It is like a feedback loop with no stopping citerion: 'Inputting' an answer of 50% on the first iteration makes the next iteration return an answer of 25%, which in turn puts the NEXT iteration at 50% etc. etc. |
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