The experimental primary school carried out spring tree planting activities. The number of trees planted in grades 3 to 6 was 132, 236, 305, and 319 respectively. How many trees are planted in each grade on average?
实验小学开展春季植树活动，三至六年级植树的棵数分别是132棵、236棵、305棵、319棵，平均每个年级植树多少棵？
<gadget id="calculator">132 + 236 + 305 + 319</gadget>
<output>992</output>

<gadget id="calculator">992 / 4</gadget>
<output>248</output>

<result>248</result>