Maths

>>364063
You must be a bad group member too, because this is easy stuff.
i
A) Literally 400/600
B) Literally 320/400
C) Literally 40/200
D) Literally 160/200
E) Literally checking to see if 480/600 = 320/400 (it does)
ii
A) Literally writing what they told you in a table
B) Literally multiplying each value by its probability and adding it all together, then doing the same thing again except each value is squared and you take the square root at the end. I came up with 3.554 expected, std. dev. of 5.563, but I could be off since I forgot all this shit mostly.