The Student Room Group

Maths

There are 644 boys and 520 girls in a school
the probability that a boy chosen at random studies french is 3/7
the probability that a girl chosen at random studies french 5/8

A) work out the number of students in the school who study french?

B) what is the probability as a fractio that a student chosen at random from the whole school does not study french ?


Can anyone help i have attempted but cant manage to find the answer
Reply 1
A) 601.

(644/7)×3=276
(520/8)×5=325
Reply 2
Tha
Original post by Bio 7
A) 601.

(644/7)×3=276
(520/8)×5=325


Thanks
Original post by lara36
There are 644 boys and 520 girls in a school
the probability that a boy chosen at random studies french is 3/7
the probability that a girl chosen at random studies french 5/8

A) work out the number of students in the school who study french?

B) what is the probability as a fractio that a student chosen at random from the whole school does not study french ?


Can anyone help i have attempted but cant manage to find the answer


image-f5ca523d-eff6-429e-8b10-c914d3fef78a239954377-compressed.jpg.jpeg
this should help u through the whole problem if u don't understand how to do any part let me know and also let me know how helpful this was :wink:
Original post by lara36
There are 644 boys and 520 girls in a school
the probability that a boy chosen at random studies french is 3/7
the probability that a girl chosen at random studies french 5/8

A) work out the number of students in the school who study french?

B) what is the probability as a fractio that a student chosen at random from the whole school does not study french ?


Can anyone help i have attempted but cant manage to find the answer

always draw a tree diagram Nd you will see all the answers automatically :smile: that's what I do with all the probability questions and they always work
Reply 5
Original post by brainmaster
always draw a tree diagram Nd you will see all the answers automatically :smile: that's what I do with all the probability questions and they always work


Ive got the answer for that one could you help on another ?
Reply 6
5666C568-0223-4740-AAC5-86F59E93AB86.jpg.jpeg
Please make your thread titles more specific
E.g. “Maths”
Reply 8
Original post by Y11_Maths
Please make your thread titles more specific
E.g. “Maths”


Sorry ill make it more clear im just new here
Original post by lara36
Sorry ill make it more clear im just new here


No worries, welcome to TSR :smile:
Reply 10
Original post by Y11_Maths
No worries, welcome to TSR :smile:


Thanks
Original post by lara36
5666C568-0223-4740-AAC5-86F59E93AB86.jpg.jpeg


image-453911df-e7af-4872-808f-92f39053e1c52117591301-compressed.jpg.jpeg

here you go. Let me know you dint understand something :smile:
Reply 12
Original post by brainmaster
image-453911df-e7af-4872-808f-92f39053e1c52117591301-compressed.jpg.jpeg

here you go. Let me know you dint understand something :smile:


Thank ive got it could you help with this also B56401CB-2CC4-4C62-9B86-108AE3DB9E66.jpg.jpeg
Original post by lara36
Thank ive got it could you help with this also B56401CB-2CC4-4C62-9B86-108AE3DB9E66.jpg.jpeg


same concept again;
image-a87492ea-56eb-4120-9dbf-dc638c5a3cf5-1884267478-compressed.jpg.jpeg

I hope u r understanding all this and not just using the answers
Reply 14
Original post by brainmaster
same concept again;
image-a87492ea-56eb-4120-9dbf-dc638c5a3cf5-1884267478-compressed.jpg.jpeg

I hope u r understanding all this and not just using the answers


Yes i understand what your saying in the answer but anyway thank you for all your help
Original post by lara36
Yes i understand what your saying in the answer but anyway thank you for all your help


your welcome and you can ask me more if you like I'll be happy to help but i want u to understand what I'm doing

Quick Reply

Latest