Wait...you're not serious are you? Mew, or Mu is a greek character for mean, or expected value (E(X)), also it apparently means 'average value' on the 2010 TSSM exam 2. Standard deviation is a measure of spread, the square root of the variance.
Good luck! I've got mine on Wednesday.
I am serious unfortunately 

 Still working on Year 11 prob atm, haven't touched Year 12 prob. SAC on Wednesday too, MHS?
Just ace english and your atar will be okay 
Glhf for meth tho, looks like you'll need it xD
Perhaps I will 'fall ill' on Wednesday 

Nah jks I'm fucked lol
This should be of assistance, don't know what the others are talking about! Yep, I'm also screwed for upcoming methods sac 
HAHAHAHAHA that's exactly what I thought too, when I heard my Methods teacher say 'mew' in class
Got mine this week as well, mines only 80 mins though.
3 Hours? That's ridiculous - although you do go to MHS I guess.
Yes, it is most fucked. Good luck for your sac 

MHS only has like three (?) "SACs". Each 3 hour block is divided into parts with different weightings for VCAA SAC purposes. It's all highly dodgy.
Shhhh...ut uuup! It's a secret!
