https://fknd12.tistory.com/60

<h5 th:text="${'개수: ' + #lists.size(list)}"> </h5>
<h5 th:text="${'합계: ' + #aggregates.sum(list.![rating]) * 1.0}"> </h5>
<h3 th:text="${'평균점수: ' + #numbers.formatDecimal(#aggregates.sum(list.![rating])*1.0 / #lists.size(list), 1, 1)}"> </h3>