The temperature measured by the meteorological team at 7:00, 9:00, 15:00, and 21:00: 12°C, 15°C, 18°C, and 13°C respectively. What is the average temperature of the day? What is the correct column
气象小组在7点、9点、15点、21点各测得气温分别为：12℃、15℃、18℃、13℃．这一天平均气温是多少度？正确的列式是多少
<gadget id="calculator">12 + 15 + 18 + 13</gadget>
<output>58</output>

<gadget id="calculator">58 / 4</gadget>
<output>29/2 = around 14.5</output>

<result>29/2 = around 14.5</result>