Is it okay if I ask for a full tutorial on math.random?

There's not a lot to math.random, so I may as well tell you as much as you probably need to know.

Basics

There are 3 ways to use math.random. The most useful way is this:

local Number = math.random(min, max)

where min is the minimum and max is the maximum. For example, in this code:

local Number = math.random(3, 11)

Number will be a number between 3 and 11, inclusive.

There are some shorter ways to use it, for example:

local Number = math.random(max)

will return a number between 1 and max, and this:

local Number = math.random()

will return a number between 0 and 1.

However...

As the wiki article states, the number generated depends on what the last one generated was. This means that the sequence of numbers will be the same every time you run the game. To get around this, you use the math.randomseed function. Usually, you want to set it to some external influence, like the value of tick():

math.randomseed(tick())

Hopefully this explains everything you need to know.

This isn't really a good tutorial, but oh well.

If you want random sounds on a npc, you may want to use a table with the sound ID's in it, and then select a random one from it, and insert it into a sound.

Incase you dont know what a table is, this is one.

local table = { var1, var2, var3 }

As for math.random() you'll want to use something that automatically detects how many things are in a table, just because you dont need to change the math.random() after adding more sounds that way.

local var4 = math.random( 1, 10 )

This will pick a random number from 1 to 10 that var4 will become. To use the automatical table content amount detection as stated before, it's really simple!

Just switch out the 10 in math.random( 1, 10 ) with #table. Doing so will make the math.random() go from 1 to however many things there are in the table.

local soundtable = { sound1, sound2, sound3, sound4 }

local ran = math.random(1,#soundtable)

sound.SoundId = soundtable[ran]

In the code stated above, soundtable[ran] checks the table "soundtable" for any content at whatever number "ran" is.

Alternatively, to shrink the code, you can use the following

local soundtable = { sound1, sound2, sound3, sound4 }

sound.SoundId = soundtable[math.random( 1, #soundtable )]

Hopefully this helped in some way :|

Also, you can use math.random in a variety of different ways, the way i just showed is just the one I prefer.

Another more inefficient but less advances way, is the following

local var = math.random(1,3)

if var == 1 then
    sound.SoundId = "id1"
elseif var == 2 then
    sound.SoundId = "id2"
elseif var == 3 then
    sound.SoundId = "id3"
end

im bad at doing tutorials allright?