• Want to level up your HSC Maths prep?
    Get some real practice on those harder questions!
    Click here for details and register for the BoS Trials now!

Predictions for Maths Standard 2 exam? (1 Viewer)

suckmytoes55

New Member
Joined
Aug 23, 2023
Messages
8
Gender
Female
HSC
2024
hi guys what conversions do we need to know, e.g I know that 1m cubed = 1kL but that's about it :(
 

utopianimal

Active Member
Joined
Dec 27, 2023
Messages
135
Gender
Male
HSC
2024
hey so u guys know why sometimes for normal distribution, we have to minus 0.5???, could someone explain and maybe indicate when i need to do this pleaseeee
 

mellysmelly

Active Member
Joined
Nov 13, 2023
Messages
114
Gender
Female
HSC
2024
hey so u guys know why sometimes for normal distribution, we have to minus 0.5???, could someone explain and maybe indicate when i need to do this pleaseeee
um yes
so the questions they ask are like WHAT IS THE PROBABILIU FROM 0-whatever.... u take away .5 bc .5 is below the mean, hence bellow 0? idk if that makes sense I hope it does
 
  • Like
Reactions: bcv

mellysmelly

Active Member
Joined
Nov 13, 2023
Messages
114
Gender
Female
HSC
2024
hey so u guys know why sometimes for normal distribution, we have to minus 0.5???, could someone explain and maybe indicate when i need to do this pleaseeee
1729420998559.png
For normal distribution, you always assume 50% of the data is lower than the mean and 50% is above the mean. Remember the mean is considered to have a z-score of 0.

The table tells us that as the z-score increases, so do the percentage of scores covered.

Since the question is asking what is the probability for selecting a scores between 0 and 1.94, and knowing 0.9738 of the data has a z-score of either 1.94 or lower; subtracting 0.5 takes away all the z-scores below the mean.
 

utopianimal

Active Member
Joined
Dec 27, 2023
Messages
135
Gender
Male
HSC
2024
View attachment 45080
For normal distribution, you always assume 50% of the data is lower than the mean and 50% is above the mean. Remember the mean is considered to have a z-score of 0.

The table tells us that as the z-score increases, so do the percentage of scores covered.

Since the question is asking what is the probability for selecting a scores between 0 and 1.94, and knowing 0.9738 of the data has a z-score of either 1.94 or lower; subtracting 0.5 takes away all the z-scores below the mean.
thank uuuuuu
 
Joined
Oct 15, 2024
Messages
49
Gender
Male
HSC
2024
this might be a stupid question but just confirming, its possible to use both sine rule and cosine rule right for a question if you have the required information?

like both would work right?

bc sine rule is: ASA and SSA
and cosine rule is: SSS, SAS


SSA is the same as SAS, so both sine and cos would work for a specific question that has SSA.


am I trippin?
 

bcv

Well-Known Member
Joined
Apr 3, 2024
Messages
306
Location
between your walls
Gender
Female
HSC
2024
this might be a stupid question but just confirming, its possible to use both sine rule and cosine rule right for a question if you have the required information?

like both would work right?

bc sine rule is: ASA and SSA
and cosine rule is: SSS, SAS


SSA is the same as SAS, so both sine and cos would work for a specific question that has SSA.


am I trippin?
you should be fine, ive used sine when they did cosine and i got the same answer, dw
 

utopianimal

Active Member
Joined
Dec 27, 2023
Messages
135
Gender
Male
HSC
2024
View attachment 45080
For normal distribution, you always assume 50% of the data is lower than the mean and 50% is above the mean. Remember the mean is considered to have a z-score of 0.

The table tells us that as the z-score increases, so do the percentage of scores covered.

Since the question is asking what is the probability for selecting a scores between 0 and 1.94, and knowing 0.9738 of the data has a z-score of either 1.94 or lower; subtracting 0.5 takes away all the z-scores below the mean.
um yes
so the questions they ask are like WHAT IS THE PROBABILIU FROM 0-whatever.... u take away .5 bc .5 is below the mean, hence bellow 0? idk if that makes sense I hope it does
so basically if it says from 0-whatver then u minus 0.5 but if it gives a number and says probaility of more than that number then u minus by 1 right???
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top