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Hey

can anyone answer this question for me (sorry in advance I don't have the answer)

Q15)

A survey was done into subjects studied at A- Level

37% of students took Mathematics

24% of students took Physics

75% of students taking Physics also took Mathematics

X is the event a student took Maths

Y is the event a student took Physics

Work out P(X U Y)

Please help!

Muchas gracias in advance

can anyone answer this question for me (sorry in advance I don't have the answer)

Q15)

A survey was done into subjects studied at A- Level

37% of students took Mathematics

24% of students took Physics

75% of students taking Physics also took Mathematics

X is the event a student took Maths

Y is the event a student took Physics

Work out P(X U Y)

Please help!

Muchas gracias in advance

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(Original post by

Draw a vienn diagram and it should be clearer from there

**cpdavis**)Draw a vienn diagram and it should be clearer from there

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#4

(Original post by

Hey

can anyone answer this question for me (sorry in advance I don't have the answer)

Q15)

A survey was done into subjects studied at A- Level

37% of students took Mathematics

24% of students took Physics

75% of students taking Physics also took Mathematics

X is the event a student took Maths

Y is the event a student took Physics

Work out P(X U Y)

Please help!

Muchas gracias in advance

**bambi_eyes**)Hey

can anyone answer this question for me (sorry in advance I don't have the answer)

Q15)

A survey was done into subjects studied at A- Level

37% of students took Mathematics

24% of students took Physics

75% of students taking Physics also took Mathematics

X is the event a student took Maths

Y is the event a student took Physics

Work out P(X U Y)

Please help!

Muchas gracias in advance

24% take least physics

75% of 24% take both = 18% take both

the remainder take neither

image a venn diagram

on the circle to the left is 37% of students which take M

on the circle to the right is 6% of students which take P

in the intersection 18% of students which take P and M

p(XUY) means the probability that a student is in any of the circles or the intersection of the diagram

people inside the diagram = 37% + 6% + 18% = 61%

p(61/100)

I rushed this a bit so just check over for any mistakes, if there are any, sorry

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(Original post by

37% take at least maths

24% take least physics

75% of 24% take both = 18% take both

the remainder take neither

image a venn diagram

on the circle to the left is 37% of students which take M

on the circle to the right is 6% of students which take P

in the intersection 18% of students which take P and M

p(XUY) means the probability that a student is in any of the circles or the intersection of the diagram

people inside the diagram = 37% + 6% + 18% = 61%

p(61/100)

I rushed this a bit so just check over for any mistakes, if there are any, sorry

**hihihi!!!**)37% take at least maths

24% take least physics

75% of 24% take both = 18% take both

the remainder take neither

image a venn diagram

on the circle to the left is 37% of students which take M

on the circle to the right is 6% of students which take P

in the intersection 18% of students which take P and M

p(XUY) means the probability that a student is in any of the circles or the intersection of the diagram

people inside the diagram = 37% + 6% + 18% = 61%

p(61/100)

I rushed this a bit so just check over for any mistakes, if there are any, sorry

oh do you think you could explain what P( A upside down u symbol B) means as well???

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#6

(Original post by

Thankyou sooooooooooooo much ( rep is coming your way)

oh do you think you could explain what P( A upside down u symbol B) means as well???

**bambi_eyes**)Thankyou sooooooooooooo much ( rep is coming your way)

oh do you think you could explain what P( A upside down u symbol B) means as well???

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#7

**hihihi!!!**)

37% take at least maths

24% take least physics

75% of 24% take both = 18% take both

the remainder take neither

image a venn diagram

on the circle to the left is 37% of students which take M

on the circle to the right is 6% of students which take P

in the intersection 18% of students which take P and M

p(XUY) means the probability that a student is in any of the circles or the intersection of the diagram

people inside the diagram = 37% + 6% + 18% = 61%

p(61/100)

I rushed this a bit so just check over for any mistakes, if there are any, sorry

Basically, U means OR

In probability, the probability of one event OR another is the probability of first event + probability of other

So probabilty of maths OR physics = 0.37+0.24

You'll just be wasting time drawing venn diagrams, i heard the time limit this year is 2 hours, which is half an hour less, learn quicker ways of doing your calculations

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#8

(Original post by

Wouldn't it just be easier to do 0.37+0.24=0.61?

Basically, U means OR

In probability, the probability of one event OR another is the probability of first event + probability of other

So probabilty of maths OR physics = 0.37+0.24

You'll just be wasting time drawing venn diagrams, i heard the time limit this year is 2 hours, which is half an hour less, learn quicker ways of doing your calculations

**Empty Child**)Wouldn't it just be easier to do 0.37+0.24=0.61?

Basically, U means OR

In probability, the probability of one event OR another is the probability of first event + probability of other

So probabilty of maths OR physics = 0.37+0.24

You'll just be wasting time drawing venn diagrams, i heard the time limit this year is 2 hours, which is half an hour less, learn quicker ways of doing your calculations

Oh and my teacher said that 2:30 was a massive amount of time before, and they'll probably have less questions to accomodate the time lost. Sketching a venn diagram will waste what, 30 seconds? if it helps then I think it's time well spent

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#9

(Original post by

I explained it like that because if the question is worded differently or different values are given, its best to know how to work it out instead of taking short cuts because its an easy question? I was trying to explain how to get to the answer rather than just straight up answering the question.

Oh and my teacher said that 2:30 was a massive amount of time before, and they'll probably have less questions to accomodate the time lost. Sketching a venn diagram will waste what, 30 seconds? if it helps then I think it's time well spent

**hihihi!!!**)I explained it like that because if the question is worded differently or different values are given, its best to know how to work it out instead of taking short cuts because its an easy question? I was trying to explain how to get to the answer rather than just straight up answering the question.

Oh and my teacher said that 2:30 was a massive amount of time before, and they'll probably have less questions to accomodate the time lost. Sketching a venn diagram will waste what, 30 seconds? if it helps then I think it's time well spent

And besides, you dont really need a venn diagram to answer any type of probability question (unless they ask you to draw one)

Basic rule to remember:

AND=Multiply

OR=Add

Simples.

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#10

**bambi_eyes**)

Hey

can anyone answer this question for me (sorry in advance I don't have the answer)

Q15)

A survey was done into subjects studied at A- Level

37% of students took Mathematics

24% of students took Physics

75% of students taking Physics also took Mathematics

X is the event a student took Maths

Y is the event a student took Physics

Work out P(X U Y)

Please help!

Muchas gracias in advance

0

reply

(Original post by

I did that past paper, and my teacher said that topic isn't going to come up becasue the syllabus has slightly changed... I'm not entirely sure though.

**Katherine1**)I did that past paper, and my teacher said that topic isn't going to come up becasue the syllabus has slightly changed... I'm not entirely sure though.

could other ppl confirm this?

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#12

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#13

**Katherine1**)

I did that past paper, and my teacher said that topic isn't going to come up becasue the syllabus has slightly changed... I'm not entirely sure though.

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#14

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#15

BY : Jimesh Ullas

37% take maths

24% physics

75% of 24% take both = (75% / 100) x 24 = 18% take both

Therefore,

= P(X) + P(Y) - P(XUY)

= 0.37 + 0.24 - 0.18

= 0.43 OR 43%

37% take maths

24% physics

75% of 24% take both = (75% / 100) x 24 = 18% take both

Therefore,

= P(X) + P(Y) - P(XUY)

= 0.37 + 0.24 - 0.18

= 0.43 OR 43%

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