B737-500 FLT CREW ENCOUNTERS WAKE TURB WHILE ON SADDE 6 ARR TO LAX.

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DSNDING ON THE SADDE ARR INTO LAX APPROX 10 MI N OF BAYST INTXN; WE WERE ABOUT 9 MI IN TRAIL OF AN AIR CARGO B747 ON THE SAME ARR. AS WE LEVELED AT 12000 FT WE SUDDENLY ENCOUNTERED THE WAKE TURB OF THE B747. WINDS WERE LIGHT AND VARIABLE AT 12000 FT; BUT NO MENTION FROM APCH CTL THAT WE WERE IN TRAIL OF THE HVY B747. THERE WERE OTHER ACFT AHEAD OF US AND SINCE APCH DID NOT INFORM US OF THE HVY I ASSUMED THE HVY B747 WAS ONE OF THE LEAD ACFT ON THE ARR; NOT IN FRONT. THE ACFT BUFFETED THEN QUICKLY ROLLED TO ABOUT 30-35 DEGS TO THE R; BEFORE WE COULD RECOVER CTL. THE SEATBELT SIGN WAS ON; HOWEVER; THE 3 FLT ATTENDANTS WERE IN THE AFT GALLEY WHEN WE HIT THE WAKE. ALL 3 WERE THROWN TO THE FLOOR SUSTAINING MINOR BUMPS AND BRUISE-TYPE INJURIES. AFTER ASKING APCH IF WE WERE FOLLOWING THE HVY B747; WE WERE TOLD YES AND IF WE LIKE WE COULD SLOW FARTHER TO 220 KTS FOR EXTRA SPACING. I CALLED THE CABIN TO ASK IF EVERYONE WAS OK AND THE CHIEF PURSER INFORMED ME THAT THEY WERE; HOWEVER; HURT THEMSELVES WHEN FALLING TO THE FLOOR. REMAINDER OF THE FLT WAS UNEVENTFUL AND ONCE ON THE GND IN LAX THE FLT ATTENDANTS DID NOT SEE THE NEED AT THAT TIME TO SEEK MEDICAL ATTN.