# maths help needed!Watch

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Thread starter 3 weeks ago
#1
A whole number from 1 to 15 inclusive is picked at random.

E= whole numbers from 1 to 15 inclusive
M= Multiples of 3
F= Factors of 24

Using the Venn diagram, work out which of these probabilities is greater
P( the number is a multiple of 3, given that it is a factor of 24)
OR
P( the number is a factor of 24, given that it is a multiple of 3)

You must show your working
0
3 weeks ago
#2
I would begin with drawing the venn diagram with 2 circles and and putting the values in one circle or the other or in the overlap bit.

I'm not sure if you're expected to know these as the thing question is under GCSE but if you are then you should use the formula

P(B | A) = P(A n B)/P(A)

You should then have probabilities for both cases.
0
Thread starter 3 weeks ago
#3
(Original post by Juliakinga)
A whole number from 1 to 15 inclusive is picked at random.

E= whole numbers from 1 to 15 inclusive
M= Multiples of 3
F= Factors of 24

Using the Venn diagram, work out which of these probabilities is greater
P( the number is a multiple of 3, given that it is a factor of 24)
OR
P( the number is a factor of 24, given that it is a multiple of 3)

You must show your working
I got that P(the number is a multiple of 3, given that it is a factor of 24) had a 0.5 chance and that the other one had a 0.4 chance, although I'm not sure if this is correct since I usually suck at probability
0
Thread starter 3 weeks ago
#4
(Original post by xAikx)
I would begin with drawing the venn diagram with 2 circles and and putting the values in one circle or the other or in the overlap bit.

I'm not sure if you're expected to know these as the thing question is under GCSE but if you are then you should use the formula

P(B | A) = P(A n B)/P(A)

You should then have probabilities for both cases.
Thank you!
0
3 weeks ago
#5
(Original post by Juliakinga)
A whole number from 1 to 15 inclusive is picked at random.

E= whole numbers from 1 to 15 inclusive
M= Multiples of 3
F= Factors of 24

Using the Venn diagram, work out which of these probabilities is greater
P( the number is a multiple of 3, given that it is a factor of 24)
OR
P( the number is a factor of 24, given that it is a multiple of 3)

You must show your working
I did the question and here is what I got with my working.
0
3 weeks ago
#6
(Original post by xAikx)
I did the question and here is what I got with my working.
Just noticed I made a slight error, P(MnF) should be 1/5 I believe. Change the value of P(MnF) accordingly and correct the conclusion to the result you get. The main idea is there anyways xd
0
Thread starter 3 weeks ago
#7
(Original post by Juliakinga)
A whole number from 1 to 15 inclusive is picked at random.

E= whole numbers from 1 to 15 inclusive
M= Multiples of 3
F= Factors of 24

Using the Venn diagram, work out which of these probabilities is greater
P( the number is a multiple of 3, given that it is a factor of 24)
OR
P( the number is a factor of 24, given that it is a multiple of 3)

You must show your working
(Original post by xAikx)
I did the question and here is what I got with my working.
Thank you so much!!
0
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