For example, one may need to generate samples drawn from a normallydistributedpopulation or may need to compute the standard deviation of a large data set or plot a histogram.
例如，可能需要自常态分配数量之产生样本或需要计算大量资料的标准差或绘制直方图。
2
Because the requirements for many nutrients are not normallydistributed, other considerations of population variability frequently are necessary.