I tried 
 
 
beta = {};
For( i = 1, i <= MEnum, i++,
	beta[i] = Random uniform.( 30, 50 );
	Print( betai );
);
 
MEnum is defined above all this and is working fine.
But I am getting this error:
 
Name Unresolved: Random uniform. in access or evaluation of 'Random uniform.' , Random uniform.( 30, 50 ) /*###*/