# Tree diagram help

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#1
Im not sure what to do next to find the answer

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4 years ago
#2
11/50 safe
1
4 years ago
#3
I'm rubbish at probability, well, probably!

It looks like you've done all the calculations. What is the total probability of arriving late in London? There are two paths that lead to that, so I'd add those probabilities.
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#4
(Original post by RogerOxon)
I'm rubbish at probability, well, probably!

It looks like you've done all the calculations. What is the total probability of arriving late in London? There are two paths that lead to that, so I'd add those probabilities.
Thank you so much

I got 11/50

Also, would you be able to help me on question D

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4 years ago
#5
The question is: How many cars are under £4000 in Peter's garage?

If you look at the box plot, you'll see that £4000 corresponds to the lower-end of the box. What does that tell you?
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4 years ago
#6
If you need some help on reading box plots, this looks good.
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#7
(Original post by RogerOxon)
The question is: How many cars are under £4000 in Peter's garage?

If you look at the box plot, you'll see that £4000 corresponds to the lower-end of the box. What does that tell you?
Does that mean John's garage has more cars than Peters or something along those lines?

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4 years ago
#8
(Original post by z_o_e)
Does that mean John's garage has more cars than Peters or something along those lines?
Part (d) is just about Peter's garage.

The box in the box plot encloses the middle 50% of the population. The £4000 value corresponds to the lower side of the box, so what proportion of the cars are below that value? Once you know that, you can calculate the number of cars below £4000.
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#9
(Original post by RogerOxon)
Part (d) is just about Peter's garage.

The box in the box plot encloses the middle 50% of the population. The £4000 value corresponds to the lower side of the box, so what proportion of the cars are below that value? Once you know that, you can calculate the number of cars below £4000.
LQ- £4000
The proportion of the cars that are below £4000 are 8.

I think I do 240/8

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4 years ago
#10
(Original post by z_o_e)
LQ- £4000
The proportion of the cars that are below £4000 are 8.

I think I do 240/8
What fraction of the cars are in the (price) lower quartile? It's quartile, as in quarter.
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#11
(Original post by RogerOxon)
What fraction of the cars are in the (price) lower quartile? It's quartile, as in quarter.
4000/4*1 = 1000

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4 years ago
#12
I got 24 but I'm 99% probs wrong

43/9 of 240?
0
4 years ago
#13
(Original post by z_o_e)
4000/4*1 = 1000
£4000 is the price - Peter has 240 cars, with a quarter of them below £4000, as that's the lower quartile price.
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#14
(Original post by RogerOxon)
£4000 is the price - Peter has 240 cars, with a quarter of them below £4000, as that's the lower quartile price.
Lol i really don't understand this.

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4 years ago
#15
(Original post by z_o_e)
Lol i really don't understand this.
We're told that Peter has 240 cars. From the box plot, a quarter are under £4000, so that's 240/4 = 60 cars under £4000.
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#16
(Original post by RogerOxon)
We're told that Peter has 240 cars. From the box plot, a quarter are under £4000, so that's 240/4 = 60 cars under £4000.
So a quarter of the total amount of cars

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4 years ago
#17
(Original post by z_o_e)
So a quarter of the total amount of cars
Yes, a quarter of the total number of cars.
0
4 years ago
#18
they still got that tree
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4 years ago
#19
this is why i give up in maths
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