From language/terms

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Returns a pseudo-random Num in the range 0..^1.

From type/Num

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method rand(Num:D: --> Num)

Returns a pseudo random number between 0 and the invocant.

From type/Range

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method rand(Range:D --> Num:D)

Returns a pseudo-random value belonging to the range.

say (1^..5).rand;                              # OUTPUT: «1.02405550417031␤» 
say (0.1..0.3).rand;                           # OUTPUT: «0.2130353370062␤»

From type/Real

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sub term:<rand> (--> Num:D)
method rand(Real:D: --> Real:D)

Returns a pseudo-random number between zero (inclusive) and the number (non-inclusive). The Bridge method is used to coerce the Real to a numeric that supports rand method.

The term form returns a pseudo-random Num between 0e0 (inclusive) and 1e0 (non-inclusive.)

From type/Cool

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method rand()

Coerces the invocant to Num and returns a pseudo-random value between zero and the number.

say 1e5.rand;           # OUTPUT: «33128.495184283␤»