There are 4 classes in the third grade of Sunshine Primary School. The number of students in each class is 65, 68, 63, and 64. The average number of students in each class is.
阳光小学三年级有4个班，每个班的人数分别是65人、68人、63人、64人，平均每个班有多少人．
<gadget id="calculator">65 + 68 + 63 + 64</gadget>
<output>260</output>

<gadget id="calculator">260 / 4</gadget>
<output>65</output>

<result>65</result>