According to observations by the Meteorological Observatory, the maximum temperatures last week were 16°C, 17°C, 23°C, 24°C, 20°C, 18°C, and 15°C. What was the average maximum temperature last week?
据气象台观测，上周的最高气温分别是16℃，17℃，23℃，24℃，20℃，18℃，15℃，上周的平均最高气温是多少．
<gadget id="calculator">16 + 17 + 23 + 24 + 20 + 18 + 15</gadget>
<output>133</output>

<gadget id="calculator">133 / 7</gadget>
<output>19</output>

<result>19</result>