There are 8 elderly people in the nursing home. Their ages are 78, 76, 77, 81, 78, 78, 76, and 80. What is the average age of these 8 elderly people?
敬老院有8位老人，他们的年龄分别是78岁、76岁、77岁、81岁、78岁、78岁、76岁、80岁．这8位老人的平均年龄是多少岁．
<gadget id="calculator">78 + 76 + 77 + 81 + 78 + 78 + 76 + 80</gadget>
<output>624</output>

<gadget id="calculator">624 / 8</gadget>
<output>78</output>

<result>78</result>