Xiaoli and 4 classmates measure the number of rope skipping in 1 minute, which are: 75 times, 98 times, 60 times, 100 times, and 117 times. The five of them skipped rope on average how many times per minute.
小丽和4个同学一起测量1分钟跳绳的次数，分别是：75下、98下、60下、100下、117下．她们5人平均1分钟跳绳多少下．
<gadget id="calculator">75 + 98 + 60 + 100 + 117</gadget>
<output>450</output>

<gadget id="calculator">450 / 5</gadget>
<output>90</output>

<result>90</result>