# maths q

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I am just a little bit confused with this question 20.4

Attachment 771374771376

So in the extract from the text below, this is what is mnetioned:

Fish population

...On

so.. it's talking about averages here - so a 9litre tank could hold an average of 3 fish

In the ms it says:

"We are allowed no more than 2.5cm of fish for 4.5litres of water"

so it's

Attachment 771374771376771300

Can someone help with my confusion on this? Thanks

Attachment 771374771376

So in the extract from the text below, this is what is mnetioned:

Fish population

...On

**average**there should be no more than 2.5cm of fish per 4.5litres of water, e.g. a 9-litre tank could take 1 fish of 5cm, 2 fish of 2.5 cm each etcso.. it's talking about averages here - so a 9litre tank could hold an average of 3 fish

In the ms it says:

"We are allowed no more than 2.5cm of fish for 4.5litres of water"

so it's

**not an average**of 2.5cm of fish for 4.5 litres of waterAttachment 771374771376771300

Can someone help with my confusion on this? Thanks

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#2

(Original post by

I am just a little bit confused with this question 20.4

Attachment 771374771376

So in the extract from the text below, this is what is mnetioned:

Fish population

...On

so.. it's talking about averages here - so a 9litre tank could hold an average of 3 fish

In the ms it says:

"We are allowed no more than 2.5cm of fish for 4.5litres of water"

so it's

Attachment 771374771376771300

Can someone help with my confusion on this? Thanks

**sienna2266**)I am just a little bit confused with this question 20.4

Attachment 771374771376

So in the extract from the text below, this is what is mnetioned:

Fish population

...On

**average**there should be no more than 2.5cm of fish per 4.5litres of water, e.g. a 9-litre tank could take 1 fish of 5cm, 2 fish of 2.5 cm each etcso.. it's talking about averages here - so a 9litre tank could hold an average of 3 fish

In the ms it says:

"We are allowed no more than 2.5cm of fish for 4.5litres of water"

so it's

**not an average**of 2.5cm of fish for 4.5 litres of waterAttachment 771374771376771300

Can someone help with my confusion on this? Thanks

I think the ms probably does mean on average, as fish move around so it’s unlikely to be as literal as they have said it. Did you get the right answer? If not what was the question?

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(Original post by

If I understand you correctly, the mark scheme doesn’t mention the word average and that is where your confusion lies.

I think the ms probably does mean on average, as fish move around so it’s unlikely to be as literal as they have said it. Did you get the right answer? If not what was the question?

**Nicole14510**)If I understand you correctly, the mark scheme doesn’t mention the word average and that is where your confusion lies.

I think the ms probably does mean on average, as fish move around so it’s unlikely to be as literal as they have said it. Did you get the right answer? If not what was the question?

So i think i probs rambled too much and didnt get my point clear enough.

so it's this bit I don't get - this is in the text provided before the questions

Fish population

...On

**average**there should be no more than 2.5cm of fish per 4.5litres of water, e.g. a 9-litre tank could take 1 fish of 5cm, 2 fish of 2.5 cm each etc

What do they mean here? I don't understand what they are trying to show by giving the 9 litre example

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#4

What they are trying to say is that you don’t have to just have fish that are exactly 2.5 cm long. By giving the 9L example they are saying that you could have one 5 cm fish and that still be equivalent to 2.5 cm of fish per 4.5L, even though that’s only half a fish in the 4.5L volume,

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#5

(Original post by

Hey

So i think i probs rambled too much and didnt get my point clear enough.

so it's this bit I don't get - this is in the text provided before the questions

Fish population

...On

What do they mean here? I don't understand what they are trying to show by giving the 9 litre example

**sienna2266**)Hey

So i think i probs rambled too much and didnt get my point clear enough.

so it's this bit I don't get - this is in the text provided before the questions

Fish population

...On

**average**there should be no more than 2.5cm of fish per 4.5litres of water, e.g. a 9-litre tank could take 1 fish of 5cm, 2 fish of 2.5 cm each etcWhat do they mean here? I don't understand what they are trying to show by giving the 9 litre example

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(Original post by

What they are trying to say is that you don’t have to just have fish that are exactly 2.5 cm long. By giving the 9L example they are saying that you could have one 5 cm fish and that still be equivalent to 2.5 cm of fish per 4.5L, even though that’s only half a fish in the 4.5L volume,

**Nicole14510**)What they are trying to say is that you don’t have to just have fish that are exactly 2.5 cm long. By giving the 9L example they are saying that you could have one 5 cm fish and that still be equivalent to 2.5 cm of fish per 4.5L, even though that’s only half a fish in the 4.5L volume,

Also, a better way to word my confusion haha:

You know where they mention " On average, there should be no more than 2.5cm of fish per 4.5 litres of water"

It's just like they want to tell you that the average length of a certain number of fish in 4.5 litres of water is 2.5cm at the most.

Could you kindly let me know your thoughts on this?

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(Original post by

You can't have half a fish so they are saying 2.5 cm of fish to 4.5 litres is the same as 5 cm of fish to 9 litres [they could say 10 cm of fish to 18 litres of water or any multiple]

**Muttley79**)You can't have half a fish so they are saying 2.5 cm of fish to 4.5 litres is the same as 5 cm of fish to 9 litres [they could say 10 cm of fish to 18 litres of water or any multiple]

The reason being is:

You know where they mention " On average, there should be no more than 2.5cm of fish per 4.5 litres of water"

It's just like they want to tell you that the average length of a certain number of fish in 4.5 litres of water is 2.5cm at the most.

Could you kindly let me know your thoughts on this?

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#8

(Original post by

Hey thanks but what do you mean by "even though that’s only half a fish in the 4.5L volume"

Also, a better way to word my confusion haha:

You know where they mention " On average, there should be no more than 2.5cm of fish per 4.5 litres of water"

It's just like they want to tell you that the average length of a certain number of fish in 4.5 litres of water is 2.5cm at the most.

Could you kindly let me know your thoughts on this?

**sienna2266**)Hey thanks but what do you mean by "even though that’s only half a fish in the 4.5L volume"

Also, a better way to word my confusion haha:

You know where they mention " On average, there should be no more than 2.5cm of fish per 4.5 litres of water"

It's just like they want to tell you that the average length of a certain number of fish in 4.5 litres of water is 2.5cm at the most.

Could you kindly let me know your thoughts on this?

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(Original post by

Yes I believe that is what they are telling you.

**Nicole14510**)Yes I believe that is what they are telling you.

This is what I thought it meant:

You know where they mention " On average, there should be no more than 2.5cm of fish per 4.5 litres of water"

It's just like they want to tell you that the average length of a certain number of fish in 4.5 litres of water is 2.5cm at the most.

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#10

(Original post by

But isn't this different to what Muttley79 mentioned "You can't have half a fish so they are saying 2.5 cm of fish to 4.5 litres is the same as 5 cm of fish to 9 litres [they could say 10 cm of fish to 18 litres of water or any multiple] "

This is what I thought it meant:

You know where they mention " On average, there should be no more than 2.5cm of fish per 4.5 litres of water"

It's just like they want to tell you that the average length of a certain number of fish in 4.5 litres of water is 2.5cm at the most.

**sienna2266**)But isn't this different to what Muttley79 mentioned "You can't have half a fish so they are saying 2.5 cm of fish to 4.5 litres is the same as 5 cm of fish to 9 litres [they could say 10 cm of fish to 18 litres of water or any multiple] "

This is what I thought it meant:

You know where they mention " On average, there should be no more than 2.5cm of fish per 4.5 litres of water"

It's just like they want to tell you that the average length of a certain number of fish in 4.5 litres of water is 2.5cm at the most.

2.5cm of fish to 4.5 litres of water is the max so 1 fish 2.5 cm long or 2 fish 1,25 cm long or ...

is the same as 5 cm of fish to 9 litres of water [but its easier to provide some examples with these numbers] mean 5 fish 1 cm each, 2 fish 2.5cm

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(Original post by

It's to do with how many fish a certain volume of water can support ie enough oxygen for them.

2.5cm of fish to 4.5 litres of water is the max so 1 fish 2.5 cm long or 2 fish 1,25 cm long or ...

is the same as 5 cm of fish to 9 litres of water [but its easier to provide some examples with these numbers] mean 5 fish 1 cm each, 2 fish 2.5cm

**Muttley79**)It's to do with how many fish a certain volume of water can support ie enough oxygen for them.

2.5cm of fish to 4.5 litres of water is the max so 1 fish 2.5 cm long or 2 fish 1,25 cm long or ...

is the same as 5 cm of fish to 9 litres of water [but its easier to provide some examples with these numbers] mean 5 fish 1 cm each, 2 fish 2.5cm

But don't you think the way they've worded it is rather incorrect.

Instead of "On average, there should be no more than 2.5cm of fish per 4.5 litres of water"

They should say "Generally, there should be no more than 2.5cm of fish per 4.5 litres of water"

Because

**on average**just makes it sound like the average length of a certain number of fish in 4.5 litres of water is 2.5cm at the most.

Or is it just me?:/

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#12

(Original post by

Thanks- I get you

But don't you think the way they've worded it is rather incorrect.

Instead of "On average, there should be no more than 2.5cm of fish per 4.5 litres of water"

They should say "Generally, there should be no more than 2.5cm of fish per 4.5 litres of water"

Because

Or is it just me?:/

**sienna2266**)Thanks- I get you

But don't you think the way they've worded it is rather incorrect.

Instead of "On average, there should be no more than 2.5cm of fish per 4.5 litres of water"

They should say "Generally, there should be no more than 2.5cm of fish per 4.5 litres of water"

Because

**on average**just makes it sound like the average length of a certain number of fish in 4.5 litres of water is 2.5cm at the most.Or is it just me?:/

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(Original post by

It is a bit clumsily expressed but I have kept fish so have come across this sort of thing.

**Muttley79**)It is a bit clumsily expressed but I have kept fish so have come across this sort of thing.

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