jQuery count selected checkbox length and update value

var count_service = jQuery('#checkboxes2 label input').filter(':checked').length;
          if(count_service>1){
           jQuery('#servicefilter option').text(count_service+' Services Selected');
          }else if(count_service==1){
              chk_lbl = jQuery('#checkboxes2 label input').filter(':checked').val();
              chk_lbl = chk_lbl.replace("-", " ");
              jQuery('#servicefilter option').text(chk_lbl);
          }else{
              jQuery('#servicefilter option').text('Services');
          }