The majority of all sessions missed during the week of 4 May to 7 May were due to some schools being closed to all pupils (code #) for use as polling stations and illness (code I).
Roedd mwyafrif yr holl sesiynau a gollwyd yn ystod yr wythnos rhwng 4 Mai i 7 Mai oherwydd bod rhai ysgolion ar gau i bob disgybl i’w defnyddio fel gorsafoedd pleidleisio (cod #) neu salwch (cod I).