学生平均每天要花三个小时来完成作业，但是如果遇到难题，完成作业的时间就得延长。
On average, students have to spend 3 hours finishing homework every day, but if we are stuck by difficult questions, the time will be extended.
在工业工程中，生产线平衡率是衡量生产线各工序作业时间平均化状况以及生产线生产效率的指标。
In engineering, line Balancing Rate is the quota that measures the average situation of every cycle time in working procedure and the production efficiency on processing line.
我对这资料做的第一件事是计算十二个作业中的每一个所花费的时间的平均值、最小值、极大值和标准差。
The first thing I did with this data was to calculate the average, minimum, maximum, and standard deviation of hours spent on each of twelve assignments.
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