insert random values into sql table

I'm trying to insert four random values into my sql table TRandomCodes. I've never tried this but below is the table I'm trying to insert the random values into. The random values I want to insert are at intRandomCodeID 21.

INSERT INTO TRandomCodes ( intRandomCodeID ,intRandomCode ,intStudyID, strTreatment, blnAvailable )
VALUES   ( 1,1000, 12345, 'A', 'T' )
        ,( 2,1001, 12345,   'P', 'T' )
        ,( 3,1002, 12345,   'A', 'T' )
        ,( 4, 1003, 12345,  'P', 'T' )
        ,( 5, 1004, 12345,  'P', 'T' )
        ,( 6, 1005, 12345,  'A', 'T' )
        ,( 7, 1006, 12345,  'A', 'T' )
        ,( 8, 1007, 12345,  'P', 'T' )
        ,( 9, 1008, 12345,  'A', 'T' )
        ,( 10, 1009, 12345, 'P', 'T' )
        ,( 11, 1010, 12345, 'P', 'T' )
        ,( 12, 1011, 12345, 'A', 'T' )
        ,( 13, 1012, 12345, 'P', 'T' )
        ,( 14, 1013, 12345, 'A', 'T' )
        ,( 15, 1014, 12345, 'A', 'T' )
        ,( 16, 1015, 12345, 'A', 'T' )
        ,( 17, 1016, 12345, 'P', 'T' )
        ,( 18, 1017, 12345, 'P', 'T' )
        ,( 19, 1018, 12345, 'A', 'T' )
        ,( 20, 1019, 12345, 'P', 'T' )
        ,( 21, Rand(), Rand(), Rand(), Rand() )
        ,( 22, 5000, 54321, 'A', 'T' )
        ,( 23, 5001, 54321, 'A', 'T' )
        ,( 24, 5002, 54321, 'A', 'T' )
        ,( 25, 5003, 54321, 'A', 'T' )
        ,( 26, 5004, 54321, 'A', 'T' )
        ,( 27, 5005, 54321, 'A', 'T' )
        ,( 28, 5006, 54321, 'A', 'T' )
        ,( 29, 5007, 54321, 'A', 'T' )
        ,( 30, 5008, 54321, 'A', 'T' )
        ,( 31, 5009, 54321, 'A', 'T' )
        ,( 32, 5010, 54321, 'P', 'T' )
        ,( 33, 5011, 54321, 'P', 'T' )
        ,( 34, 5012, 54321, 'P', 'T' )
        ,( 35, 5013, 54321, 'P', 'T' )
        ,( 36, 5014, 54321, 'P', 'T' )
        ,( 37, 5015, 54321, 'P', 'T' )
        ,( 38, 5016, 54321, 'P', 'T' )
        ,( 39, 5017, 54321, 'P', 'T' )
        ,( 40, 5018, 54321, 'P', 'T' )
        ,( 41, 5019, 54321, 'P', 'T' )