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Original poster

Maths help

5 replies

missk167 · 29/09/2021 17:04

Hey guys I'm doing a maths exam for my level 5 and struggling with this question. Can anyone help. Question attached

Maths help
OP posts:
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TeenMinusTests · 29/09/2021 18:47

I will give you some general probability pointers:

  • probability adds to 1
  • probability of (not something) = 1 - probability (something)

If A and B are independent (ie not linked) then:
probability (A and B) = probability (A) x probability (B)

Those lead to multiply along the branches of a probability tree diagram, and add the leaves.

If you understand this you should be able to do the question, if you don't then you definitely don't understand probability.

TeenMinusTests · 29/09/2021 18:40

I don't want to be unhelpful, but you are posting a lot of questions about probability, and so you really should go back to your tutor for help as you clearly are struggling in general with it.
Coupled with this is a summative assessment exam so should presumably be done independently?
If you need to be able to do this for your qualification, I think it is important you are actually able to do it.

LIZS · 29/09/2021 17:09

You do know your name is in the corner? Total number in gym (A) number of women doing weights(B) . Answer B/A

Original poster
missk167 · 29/09/2021 17:07

So I realise the picture is grainy.

The tree diagram shows the number of people who attend the gym on a Saturday and what exercises they choose to do.

If you randomly selected one person what is the probability of choosing a women who lifts weights?

What is the probality of selecting a man who attends exercise classes?

In the boxes men = 0.65 ( in first box) lifting weights is 0.62

Women first box is blank
Exercise classes is 0.44
Lifting weights is blank.
Have a look at image to see the set up.

Thanks guys

OP posts:
dementedpixie · 29/09/2021 17:06

I cant read the numbers on the diagram