✓ Accepted answer
math.random() generates pseudo-random numbers uniformly distributed. Supplying argument alters its behaviour:
math.random() with no arguments generates a real number between 0 and 1.
math.random(upper) generates integer numbers between 1 and upper.
math.random(lower, upper) generates integer numbers between lower and upper.
= math.random()
0.0012512588885159
= math.random()
0.56358531449324
= math.random(100)
20
= math.random(100)
81
= math.random(70,80)
76
= math.random(70,80)
75
Your numbers aren't integers, if you want to generate a decimal use math.random() or create a larger random number and divide it:
local randompitch = math.random(130, 220)/100