Xiaohua took part in a singing competition, and the five judges scored: 85 points, 88 points, 90 points, 89 points, and 90 points. If the highest score and the lowest score are removed, what is Xiaohua's average score?
小华参加唱歌比赛，五位评委打分为：85分、88分、90分、89分、90分，去掉一个最高分和一个最低，小华平均得数多少分？
<gadget id="calculator">88 + 90 + 89</gadget>
<output>267</output>

<gadget id="calculator">267 / 3</gadget>
<output>89</output>

<result>89</result>