(make-random-integer-generator [ s ] lower-bound upper-bound)

Prose says "lower-bound (inclusive, default 0)" but the arg list shows
lower-bound as a required arg.

(make-random-boolean-generator [ s ]

Missing close parenthesis.

(make-random-string-generator [ s ] string)

Missing k argument in arg list.

(make-normal-generator [ s ] [ mean [ deviation ] ])

How would you write this as a case-lambda?

(gweighted-sampling) [ s ] obj ..).

Extra parenthesis and period.