Which of the quantities must be known before calculating the margin of error? the population size the population mean the population variance All of the answer options are correct.

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

Ineed ! the person who answers and shows their work on they got the answer first will be marked the !

Find the solution of this system of equation -7x+y=-20 9x-3y=36