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March 28, 2024, 09:02:03 pm

Author Topic: Standard Math Q+A Thread  (Read 181118 times)  Share 

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Razeen25

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Re: General Math Q+A Thread
« Reply #615 on: July 02, 2018, 12:28:20 am »
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I don’t know how to answer this question, could somebody please help? The answer is 64.
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jamonwindeyer

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Re: General Math Q+A Thread
« Reply #616 on: July 02, 2018, 12:40:58 am »
+1
I don’t know how to answer this question, could somebody please help? The answer is 64.

Hey! Here's a hint - Take the top left corner. There might be a dot there, there might not be. Two options. The one next to it might be there, it might not be. Two options there. So the top row, you'd have \(2\times2=4\) possibilities! See if you can keep the pattern going for the third, fourth, fifth and sixth dots to get 64 ;D

Razeen25

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Re: General Math Q+A Thread
« Reply #617 on: July 11, 2018, 09:13:57 pm »
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Hii, I'm really stuck on these 2 probability questions. Any help at all would be greatly appreciated!!
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RuiAce

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Re: General Math Q+A Thread
« Reply #618 on: July 11, 2018, 09:21:41 pm »
+4
Hii, I'm really stuck on these 2 probability questions. Any help at all would be greatly appreciated!!
Q9 is probably best done by listing, as far as the General course goes:
KJA JKA AJK
KAJ AKJ JAK
We see that there are 4 favourable options, so the probability is 4/6, i.e. 2/3.



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Do you know what a combination is? Because this is actually just \( \frac{4}{\text{52 choose 5}} \).

Lumenoria

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Re: General Math Q+A Thread
« Reply #619 on: July 29, 2018, 02:05:39 pm »
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Hey,
How am I supposed to do the second question? Lol I feel like it's probably really obvious but I legit have been staring at it aimlessly for the longest time. I think the diagram is just kinda confusing
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RuiAce

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Re: General Math Q+A Thread
« Reply #620 on: July 29, 2018, 02:10:11 pm »
+1
Hey,
How am I supposed to do the second question? Lol I feel like it's probably really obvious but I legit have been staring at it aimlessly for the longest time. I think the diagram is just kinda confusing


Basically two applications just means use Simpson's rule twice.

BrittyG

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Re: General Math Q+A Thread
« Reply #621 on: August 08, 2018, 12:43:32 pm »
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I feel like I've tried everything with this question, I looked at the answer and tried to work backwards too... Someone help a sister out pls

(Answers say B)
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RuiAce

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Re: General Math Q+A Thread
« Reply #622 on: August 08, 2018, 12:48:31 pm »
+1
I feel like I've tried everything with this question, I looked at the answer and tried to work backwards too... Someone help a sister out pls

(Answers say B)
At first glance I don't seem to get any of them actually...
I get an answer of \(-1.41\).

If we replace 34 numbers with 30 numbers I seem to get B incidentally.

BrittyG

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Re: General Math Q+A Thread
« Reply #623 on: August 08, 2018, 01:38:08 pm »
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At first glance I don't seem to get any of them actually...
I get an answer of \(-1.41\).

That's what I kept getting too  ???, I thought I was going crazy or something
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RuiAce

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Re: General Math Q+A Thread
« Reply #624 on: August 08, 2018, 01:48:57 pm »
+1
That's what I kept getting too  ???, I thought I was going crazy or something
Well if we're both getting the same "wrong" answer I think we should assume that the question is wrong. :D

rainyyydays

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Re: General Math Q+A Thread
« Reply #625 on: August 08, 2018, 11:28:09 pm »
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hey, know it's late! just having trouble with this q and can't find solutions... any help would be appreciated  :)

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Re: General Math Q+A Thread
« Reply #626 on: August 09, 2018, 06:29:38 am »
+3
You just need to find the area of the lake and its a really big trek because of all the pieces. :'(
You're going to be using the base x height thing for area, and also h(a+b)/2 for the trapezium (assuming that it is, because i can't tell from the picture)
the maximum volume of the lake is equal to ((110*25)/2 + (120*30)/2 + 55(120+105)/2)*3.6 = 33705 m^3
now the lake is 80% full, so the water in the lake is equal to 26964 m^3 = 26964000L
the people of the town need 740*650 L /day = 481000 L per day
to find how many days they last w/o rain its 26964000/481000 = 56.058......
you round that down since they're not gonna last the 57th day with water usage
so they last 56 days
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rainyyydays

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Re: General Math Q+A Thread
« Reply #627 on: August 09, 2018, 07:36:19 am »
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legend  ;D
 thanks!
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Re: General Math Q+A Thread
« Reply #628 on: September 24, 2018, 05:07:29 pm »
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Hello,
Just need some help on the below questions from last years HSC...

A set of data has a lower quartile of 10 and an upper quartile of 16.
What is the maximum possible range for this set of data if there are no outliers?


A solid is made up of a sphere sitting partially inside a cone.
The sphere, has a radius of 4cm and sits 2cm inside the cone. The solid has a total height of 15cm.
What is the volume of the cone, correct to the nearest cm3?

Also, i've forgotten how to calculate correlation coefficient on the calculator....can someone pleasseee remind me how...

Thanks so much :)

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Re: General Math Q+A Thread
« Reply #629 on: September 24, 2018, 09:04:11 pm »
+2
Hello,
Just need some help on the below questions from last years HSC...

A set of data has a lower quartile of 10 and an upper quartile of 16.
What is the maximum possible range for this set of data if there are no outliers?