Assigning a number to an amount of players

[DerpoDrago]

So I've been trying to make a skript where it gets half of the players online and rounds down if its not an integer, but I can't figure out the part where I assign a number to every player and randomly pick half of them out. Any help would be appreciated.
I'm on version 2.4 if that helps.

on left click with golden carrot:
    if player has permission "worldedit.navigation.up":
        set {n} to false
    if {n} is true:
        cancel event
    else:
        set {a} to player's held item
        set {n} to true
        if {a}'s name is "&4&nT&6&nh&e&na&a&nn&2&no&b&ns&3&n' &1&n&lI&d&n&ln&5&n&lf&9&n&li&f&n&ln&7&n&li&8&n&lt&0&n&ly &1&n&lG&2&n&la&3&n&lu&4&n&ln&5&n&lt&6&n&ll&7&n&le&8&n&lt":
            broadcast "&d&lPerfectly balanced"
            wait 10 seconds
            set player's health to 1
            set {s} to number of all players
            set {mo} to ({s} / 2)
            if {mo} is not an integer:
                add 00 to {mo}
            else:
                add -0.5 to {mo}
            broadcast "&d&las all things should be"

[doublepost=1580082219,1579984492][/doublepost]Thanks a lot, it worked